diff --git a/src/lib/molecules/Categories/Categories.svelte b/src/lib/molecules/Categories/Categories.svelte
index ef21e0e..0c07e2b 100644
--- a/src/lib/molecules/Categories/Categories.svelte
+++ b/src/lib/molecules/Categories/Categories.svelte
@@ -1,4 +1,6 @@
 <script lang="ts">
+  import type { Component } from "svelte";
+  import type { SvelteHTMLElements } from "svelte/elements";
   import type { Writable } from "svelte/store";
   import type { CategoryInfo } from "$lib/modules/filesystem";
   import Category from "./Category.svelte";
@@ -6,16 +8,23 @@
 
   interface Props {
     categories: Writable<CategoryInfo | null>[];
+    categoryMenuIcon?: Component<SvelteHTMLElements["svg"]>;
     onCategoryClick: (category: SelectedCategory) => void;
+    onCategoryMenuClick?: (category: SelectedCategory) => void;
   }
 
-  let { categories, onCategoryClick }: Props = $props();
+  let { categories, categoryMenuIcon, onCategoryClick, onCategoryMenuClick }: Props = $props();
 </script>
 
 {#if categories.length > 0}
   <div class="space-y-1">
     {#each categories as category}
-      <Category info={category} onclick={onCategoryClick} />
+      <Category
+        info={category}
+        menuIcon={categoryMenuIcon}
+        onclick={onCategoryClick}
+        onMenuClick={onCategoryMenuClick}
+      />
     {/each}
   </div>
 {/if}
diff --git a/src/lib/molecules/Categories/Category.svelte b/src/lib/molecules/Categories/Category.svelte
index 18d6a83..ea2c392 100644
--- a/src/lib/molecules/Categories/Category.svelte
+++ b/src/lib/molecules/Categories/Category.svelte
@@ -1,17 +1,20 @@
 <script lang="ts">
+  import type { Component } from "svelte";
+  import type { SvelteHTMLElements } from "svelte/elements";
   import type { Writable } from "svelte/store";
   import type { CategoryInfo } from "$lib/modules/filesystem";
   import type { SelectedCategory } from "./service";
 
   import IconCategory from "~icons/material-symbols/category";
-  import IconMoreVert from "~icons/material-symbols/more-vert";
 
   interface Props {
     info: Writable<CategoryInfo | null>;
+    menuIcon?: Component<SvelteHTMLElements["svg"]>;
     onclick: (category: SelectedCategory) => void;
+    onMenuClick?: (category: SelectedCategory) => void;
   }
 
-  let { info, onclick }: Props = $props();
+  let { info, menuIcon: MenuIcon, onclick, onMenuClick }: Props = $props();
 
   const openCategory = () => {
     const { id, dataKey, dataKeyVersion, name } = $info as CategoryInfo;
@@ -25,7 +28,12 @@
   const openMenu = (e: Event) => {
     e.stopPropagation();
 
-    // TODO
+    const { id, dataKey, dataKeyVersion, name } = $info as CategoryInfo;
+    if (!dataKey || !dataKeyVersion) return; // TODO: Error handling
+
+    setTimeout(() => {
+      onMenuClick!({ id, dataKey, dataKeyVersion, name });
+    }, 100);
   };
 </script>
 
@@ -40,13 +48,15 @@
       <p title={$info.name} class="flex-grow truncate font-medium">
         {$info.name}
       </p>
-      <button
-        id="open-menu"
-        onclick={openMenu}
-        class="flex-shrink-0 rounded-full p-1 active:bg-gray-100"
-      >
-        <IconMoreVert class="text-lg" />
-      </button>
+      {#if MenuIcon && onMenuClick}
+        <button
+          id="open-menu"
+          onclick={openMenu}
+          class="flex-shrink-0 rounded-full p-1 active:bg-gray-100"
+        >
+          <MenuIcon class="text-lg" />
+        </button>
+      {/if}
     </div>
   </div>
 {/if}
diff --git a/src/lib/molecules/SubCategories.svelte b/src/lib/molecules/SubCategories.svelte
index 945e29c..7b08629 100644
--- a/src/lib/molecules/SubCategories.svelte
+++ b/src/lib/molecules/SubCategories.svelte
@@ -1,5 +1,6 @@
 <script lang="ts">
-  import type { ClassValue } from "svelte/elements";
+  import type { Component } from "svelte";
+  import type { ClassValue, SvelteHTMLElements } from "svelte/elements";
   import type { Writable } from "svelte/store";
   import { EntryButton } from "$lib/components/buttons";
   import { getCategoryInfo, type CategoryInfo } from "$lib/modules/filesystem";
@@ -13,14 +14,18 @@
     info: CategoryInfo;
     onSubCategoryClick: (subCategory: SelectedCategory) => void;
     onSubCategoryCreateClick: () => void;
+    onSubCategoryMenuClick?: (category: SelectedCategory) => void;
     subCategoryCreatePosition?: "top" | "bottom";
+    subCategoryMenuIcon?: Component<SvelteHTMLElements["svg"]>;
   }
 
   let {
     info,
     onSubCategoryClick,
     onSubCategoryCreateClick,
+    onSubCategoryMenuClick,
     subCategoryCreatePosition = "bottom",
+    subCategoryMenuIcon,
     ...props
   }: Props = $props();
 
@@ -49,7 +54,12 @@
     {@render subCategoryCreate()}
   {/if}
   {#key info}
-    <Categories categories={subCategories} onCategoryClick={onSubCategoryClick} />
+    <Categories
+      categories={subCategories}
+      categoryMenuIcon={subCategoryMenuIcon}
+      onCategoryClick={onSubCategoryClick}
+      onCategoryMenuClick={onSubCategoryMenuClick}
+    />
   {/key}
   {#if subCategoryCreatePosition === "bottom"}
     {@render subCategoryCreate()}
diff --git a/src/lib/organisms/Category/Category.svelte b/src/lib/organisms/Category/Category.svelte
index b3cbd59..075a01a 100644
--- a/src/lib/organisms/Category/Category.svelte
+++ b/src/lib/organisms/Category/Category.svelte
@@ -1,33 +1,33 @@
 <script lang="ts">
   import type { Writable } from "svelte/store";
-  import {
-    getFileInfo,
-    getCategoryInfo,
-    type FileInfo,
-    type CategoryInfo,
-  } from "$lib/modules/filesystem";
+  import { getFileInfo, type FileInfo, type CategoryInfo } from "$lib/modules/filesystem";
   import type { SelectedCategory } from "$lib/molecules/Categories";
   import SubCategories from "$lib/molecules/SubCategories.svelte";
   import { masterKeyStore } from "$lib/stores";
   import File from "./File.svelte";
   import type { SelectedFile } from "./service";
 
+  import IconMoreVert from "~icons/material-symbols/more-vert";
+
   interface Props {
     info: CategoryInfo;
     onFileClick: (file: SelectedFile) => void;
     onSubCategoryClick: (subCategory: SelectedCategory) => void;
     onSubCategoryCreateClick: () => void;
+    onSubCategoryMenuClick: (subCategory: SelectedCategory) => void;
   }
 
-  let { info, onFileClick, onSubCategoryClick, onSubCategoryCreateClick }: Props = $props();
+  let {
+    info,
+    onFileClick,
+    onSubCategoryClick,
+    onSubCategoryCreateClick,
+    onSubCategoryMenuClick,
+  }: Props = $props();
 
-  let subCategories: Writable<CategoryInfo | null>[] = $state([]);
   let files: Writable<FileInfo | null>[] = $state([]);
 
   $effect(() => {
-    subCategories = info.subCategoryIds.map((id) =>
-      getCategoryInfo(id, $masterKeyStore?.get(1)?.key!),
-    );
     files = info.files?.map((id) => getFileInfo(id, $masterKeyStore?.get(1)?.key!)) ?? [];
 
     // TODO: Sorting
@@ -39,7 +39,13 @@
     {#if info.id !== "root"}
       <p class="text-lg font-bold text-gray-800">하위 카테고리</p>
     {/if}
-    <SubCategories {info} {onSubCategoryClick} {onSubCategoryCreateClick} />
+    <SubCategories
+      {info}
+      {onSubCategoryClick}
+      {onSubCategoryCreateClick}
+      {onSubCategoryMenuClick}
+      subCategoryMenuIcon={IconMoreVert}
+    />
   </div>
   {#if info.id !== "root"}
     <div class="space-y-4 bg-white p-4">
diff --git a/src/routes/(main)/category/[[id]]/CreateCategoryModal.svelte b/src/lib/organisms/CreateCategoryModal.svelte
similarity index 100%
rename from src/routes/(main)/category/[[id]]/CreateCategoryModal.svelte
rename to src/lib/organisms/CreateCategoryModal.svelte
diff --git a/src/lib/server/db/category.ts b/src/lib/server/db/category.ts
index d710b34..f5c22ff 100644
--- a/src/lib/server/db/category.ts
+++ b/src/lib/server/db/category.ts
@@ -136,9 +136,12 @@ export const setCategoryEncName = async (
 };
 
 export const unregisterCategory = async (userId: number, categoryId: number) => {
-  await db
+  const res = await db
     .deleteFrom("category")
     .where("id", "=", categoryId)
     .where("user_id", "=", userId)
-    .execute();
+    .executeTakeFirst();
+  if (res.numDeletedRows === 0n) {
+    throw new IntegrityError("Category not found");
+  }
 };
diff --git a/src/lib/server/schemas/category.ts b/src/lib/server/schemas/category.ts
index a693bee..026ce3a 100644
--- a/src/lib/server/schemas/category.ts
+++ b/src/lib/server/schemas/category.ts
@@ -27,6 +27,18 @@ export const categoryFileListResponse = z.object({
 });
 export type CategoryFileListResponse = z.infer<typeof categoryFileListResponse>;
 
+export const categoryFileRemoveRequest = z.object({
+  file: z.number().int().positive(),
+});
+export type CategoryFileRemoveRequest = z.infer<typeof categoryFileRemoveRequest>;
+
+export const categoryRenameRequest = z.object({
+  dekVersion: z.string().datetime(),
+  name: z.string().base64().nonempty(),
+  nameIv: z.string().base64().nonempty(),
+});
+export type CategoryRenameRequest = z.infer<typeof categoryRenameRequest>;
+
 export const categoryCreateRequest = z.object({
   parent: categoryIdSchema,
   mekVersion: z.number().int().positive(),
diff --git a/src/lib/server/services/category.ts b/src/lib/server/services/category.ts
index e81e458..229bea7 100644
--- a/src/lib/server/services/category.ts
+++ b/src/lib/server/services/category.ts
@@ -3,11 +3,19 @@ import {
   registerCategory,
   getAllCategoriesByParent,
   getCategory,
+  setCategoryEncName,
+  unregisterCategory,
   type CategoryId,
   type NewCategory,
 } from "$lib/server/db/category";
 import { IntegrityError } from "$lib/server/db/error";
-import { getAllFilesByCategory, getFile, addFileToCategory } from "$lib/server/db/file";
+import {
+  getAllFilesByCategory,
+  getFile,
+  addFileToCategory,
+  removeFileFromCategory,
+} from "$lib/server/db/file";
+import type { Ciphertext } from "$lib/server/db/schema";
 
 export const getCategoryInformation = async (userId: number, categoryId: CategoryId) => {
   const category = categoryId !== "root" ? await getCategory(userId, categoryId) : undefined;
@@ -28,6 +36,17 @@ export const getCategoryInformation = async (userId: number, categoryId: Categor
   };
 };
 
+export const deleteCategory = async (userId: number, categoryId: number) => {
+  try {
+    await unregisterCategory(userId, categoryId);
+  } catch (e) {
+    if (e instanceof IntegrityError && e.message === "Category not found") {
+      error(404, "Invalid category id");
+    }
+    throw e;
+  }
+};
+
 export const addCategoryFile = async (userId: number, categoryId: number, fileId: number) => {
   const category = await getCategory(userId, categoryId);
   const file = await getFile(userId, fileId);
@@ -57,6 +76,45 @@ export const getCategoryFiles = async (userId: number, categoryId: number) => {
   return { files: files.map(({ id }) => id) };
 };
 
+export const removeCategoryFile = async (userId: number, categoryId: number, fileId: number) => {
+  const category = await getCategory(userId, categoryId);
+  const file = await getFile(userId, fileId);
+  if (!category) {
+    error(404, "Invalid category id");
+  } else if (!file) {
+    error(404, "Invalid file id");
+  }
+
+  try {
+    await removeFileFromCategory(fileId, categoryId);
+  } catch (e) {
+    if (e instanceof IntegrityError && e.message === "File not found in category") {
+      error(400, "File not added");
+    }
+    throw e;
+  }
+};
+
+export const renameCategory = async (
+  userId: number,
+  categoryId: number,
+  dekVersion: Date,
+  newEncName: Ciphertext,
+) => {
+  try {
+    await setCategoryEncName(userId, categoryId, dekVersion, newEncName);
+  } catch (e) {
+    if (e instanceof IntegrityError) {
+      if (e.message === "Category not found") {
+        error(404, "Invalid category id");
+      } else if (e.message === "Invalid DEK version") {
+        error(400, "Invalid DEK version");
+      }
+    }
+    throw e;
+  }
+};
+
 export const createCategory = async (params: NewCategory) => {
   const oneMinuteAgo = new Date(Date.now() - 60 * 1000);
   const oneMinuteLater = new Date(Date.now() + 60 * 1000);
diff --git a/src/lib/services/category.ts b/src/lib/services/category.ts
new file mode 100644
index 0000000..c2018ed
--- /dev/null
+++ b/src/lib/services/category.ts
@@ -0,0 +1,21 @@
+import { callPostApi } from "$lib/hooks";
+import { generateDataKey, wrapDataKey, encryptString } from "$lib/modules/crypto";
+import type { CategoryCreateRequest } from "$lib/server/schemas";
+import type { MasterKey } from "$lib/stores";
+
+export const requestCategoryCreation = async (
+  name: string,
+  parentId: "root" | number,
+  masterKey: MasterKey,
+) => {
+  const { dataKey, dataKeyVersion } = await generateDataKey();
+  const nameEncrypted = await encryptString(name, dataKey);
+  await callPostApi<CategoryCreateRequest>("/api/category/create", {
+    parent: parentId,
+    mekVersion: masterKey.version,
+    dek: await wrapDataKey(dataKey, masterKey.key),
+    dekVersion: dataKeyVersion.toISOString(),
+    name: nameEncrypted.ciphertext,
+    nameIv: nameEncrypted.iv,
+  });
+};
diff --git a/src/routes/(fullscreen)/file/[id]/+page.svelte b/src/routes/(fullscreen)/file/[id]/+page.svelte
index 89dc04d..7097078 100644
--- a/src/routes/(fullscreen)/file/[id]/+page.svelte
+++ b/src/routes/(fullscreen)/file/[id]/+page.svelte
@@ -15,8 +15,13 @@
   import { fileDownloadStatusStore, isFileDownloading, masterKeyStore } from "$lib/stores";
   import AddToCategoryBottomSheet from "./AddToCategoryBottomSheet.svelte";
   import DownloadStatus from "./DownloadStatus.svelte";
-  import { requestFileDownload, requestFileAdditionToCategory } from "./service";
+  import {
+    requestFileDownload,
+    requestFileAdditionToCategory,
+    requestFileRemovalFromCategory,
+  } from "./service";
 
+  import IconClose from "~icons/material-symbols/close";
   import IconAddCircle from "~icons/material-symbols/add-circle";
 
   let { data } = $props();
@@ -64,6 +69,11 @@
     info = getFileInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
   };
 
+  const removeFromCategory = async (categoryId: number) => {
+    await requestFileRemovalFromCategory(data.id, categoryId);
+    info = getFileInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
+  };
+
   $effect(() => {
     info = getFileInfo(data.id, $masterKeyStore?.get(1)?.key!);
     isDownloadRequested = false;
@@ -135,7 +145,12 @@
     <div class="space-y-2">
       <p class="text-lg font-bold">카테고리</p>
       <div class="space-y-1">
-        <Categories {categories} onCategoryClick={({ id }) => goto(`/category/${id}`)} />
+        <Categories
+          {categories}
+          categoryMenuIcon={IconClose}
+          onCategoryClick={({ id }) => goto(`/category/${id}`)}
+          onCategoryMenuClick={({ id }) => removeFromCategory(id)}
+        />
         <EntryButton onclick={() => (isAddToCategoryBottomSheetOpen = true)}>
           <div class="flex h-8 items-center gap-x-4">
             <IconAddCircle class="text-lg text-gray-600" />
diff --git a/src/routes/(fullscreen)/file/[id]/AddToCategoryBottomSheet.svelte b/src/routes/(fullscreen)/file/[id]/AddToCategoryBottomSheet.svelte
index ee7714c..ce2908f 100644
--- a/src/routes/(fullscreen)/file/[id]/AddToCategoryBottomSheet.svelte
+++ b/src/routes/(fullscreen)/file/[id]/AddToCategoryBottomSheet.svelte
@@ -1,12 +1,13 @@
 <script lang="ts">
-  import { onMount } from "svelte";
   import type { Writable } from "svelte/store";
   import { BottomSheet } from "$lib/components";
   import { Button } from "$lib/components/buttons";
   import { BottomDiv } from "$lib/components/divs";
   import { getCategoryInfo, type CategoryInfo } from "$lib/modules/filesystem";
   import SubCategories from "$lib/molecules/SubCategories.svelte";
+  import CreateCategoryModal from "$lib/organisms/CreateCategoryModal.svelte";
   import { masterKeyStore } from "$lib/stores";
+  import { requestCategoryCreation } from "./service";
 
   interface Props {
     onAddToCategoryClick: (categoryId: number) => void;
@@ -17,8 +18,20 @@
 
   let category: Writable<CategoryInfo | null> | undefined = $state();
 
-  onMount(() => {
-    category = getCategoryInfo("root", $masterKeyStore?.get(1)?.key!);
+  let isCreateCategoryModalOpen = $state(false);
+
+  const createCategory = async (name: string) => {
+    if (!$category) return; // TODO: Error handling
+
+    await requestCategoryCreation(name, $category.id, $masterKeyStore?.get(1)!);
+    isCreateCategoryModalOpen = false;
+    category = getCategoryInfo($category.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
+  };
+
+  $effect(() => {
+    if (isOpen) {
+      category = getCategoryInfo("root", $masterKeyStore?.get(1)?.key!);
+    }
   });
 </script>
 
@@ -30,6 +43,7 @@
         info={$category}
         onSubCategoryClick={({ id }) =>
           (category = getCategoryInfo(id, $masterKeyStore?.get(1)?.key!))}
+        onSubCategoryCreateClick={() => (isCreateCategoryModalOpen = true)}
         subCategoryCreatePosition="top"
       />
       {#if $category.id !== "root"}
@@ -40,3 +54,5 @@
     {/if}
   </div>
 </BottomSheet>
+
+<CreateCategoryModal bind:isOpen={isCreateCategoryModalOpen} onCreateClick={createCategory} />
diff --git a/src/routes/(fullscreen)/file/[id]/service.ts b/src/routes/(fullscreen)/file/[id]/service.ts
index f48c16e..e45a108 100644
--- a/src/routes/(fullscreen)/file/[id]/service.ts
+++ b/src/routes/(fullscreen)/file/[id]/service.ts
@@ -1,6 +1,8 @@
 import { callPostApi } from "$lib/hooks";
 import { getFileCache, storeFileCache, downloadFile } from "$lib/modules/file";
-import type { CategoryFileAddRequest } from "$lib/server/schemas";
+import type { CategoryFileAddRequest, CategoryFileRemoveRequest } from "$lib/server/schemas";
+
+export { requestCategoryCreation } from "$lib/services/category";
 
 export const requestFileDownload = async (
   fileId: number,
@@ -21,3 +23,11 @@ export const requestFileAdditionToCategory = async (fileId: number, categoryId:
   });
   return res.ok;
 };
+
+export const requestFileRemovalFromCategory = async (fileId: number, categoryId: number) => {
+  const res = await callPostApi<CategoryFileRemoveRequest>(
+    `/api/category/${categoryId}/file/remove`,
+    { file: fileId },
+  );
+  return res.ok;
+};
diff --git a/src/routes/(main)/category/[[id]]/+page.svelte b/src/routes/(main)/category/[[id]]/+page.svelte
index aa551f1..cbd0e2e 100644
--- a/src/routes/(main)/category/[[id]]/+page.svelte
+++ b/src/routes/(main)/category/[[id]]/+page.svelte
@@ -3,16 +3,28 @@
   import { goto } from "$app/navigation";
   import { TopBar } from "$lib/components";
   import { getCategoryInfo, type CategoryInfo } from "$lib/modules/filesystem";
+  import type { SelectedCategory } from "$lib/molecules/Categories";
   import Category from "$lib/organisms/Category";
+  import CreateCategoryModal from "$lib/organisms/CreateCategoryModal.svelte";
   import { masterKeyStore } from "$lib/stores";
-  import CreateCategoryModal from "./CreateCategoryModal.svelte";
-  import { requestCategoryCreation } from "./service";
+  import CategoryMenuBottomSheet from "./CategoryMenuBottomSheet.svelte";
+  import DeleteCategoryModal from "./DeleteCategoryModal.svelte";
+  import RenameCategoryModal from "./RenameCategoryModal.svelte";
+  import {
+    requestCategoryCreation,
+    requestCategoryRename,
+    requestCategoryDeletion,
+  } from "./service";
 
   let { data } = $props();
 
   let info: Writable<CategoryInfo | null> | undefined = $state();
+  let selectedSubCategory: SelectedCategory | undefined = $state();
 
   let isCreateCategoryModalOpen = $state(false);
+  let isSubCategoryMenuBottomSheetOpen = $state(false);
+  let isRenameCategoryModalOpen = $state(false);
+  let isDeleteCategoryModalOpen = $state(false);
 
   const createCategory = async (name: string) => {
     await requestCategoryCreation(name, data.id, $masterKeyStore?.get(1)!);
@@ -39,6 +51,10 @@
         info={$info}
         onSubCategoryClick={({ id }) => goto(`/category/${id}`)}
         onSubCategoryCreateClick={() => (isCreateCategoryModalOpen = true)}
+        onSubCategoryMenuClick={(subCategory) => {
+          selectedSubCategory = subCategory;
+          isSubCategoryMenuBottomSheetOpen = true;
+        }}
         onFileClick={({ id }) => goto(`/file/${id}`)}
       />
     {/if}
@@ -46,3 +62,40 @@
 </div>
 
 <CreateCategoryModal bind:isOpen={isCreateCategoryModalOpen} onCreateClick={createCategory} />
+
+<CategoryMenuBottomSheet
+  bind:isOpen={isSubCategoryMenuBottomSheetOpen}
+  bind:selectedCategory={selectedSubCategory}
+  onRenameClick={() => {
+    isSubCategoryMenuBottomSheetOpen = false;
+    isRenameCategoryModalOpen = true;
+  }}
+  onDeleteClick={() => {
+    isSubCategoryMenuBottomSheetOpen = false;
+    isDeleteCategoryModalOpen = true;
+  }}
+/>
+<RenameCategoryModal
+  bind:isOpen={isRenameCategoryModalOpen}
+  bind:selectedCategory={selectedSubCategory}
+  onRenameClick={async (newName) => {
+    if (selectedSubCategory) {
+      await requestCategoryRename(selectedSubCategory, newName);
+      info = getCategoryInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
+      return true;
+    }
+    return false;
+  }}
+/>
+<DeleteCategoryModal
+  bind:isOpen={isDeleteCategoryModalOpen}
+  bind:selectedCategory={selectedSubCategory}
+  onDeleteClick={async () => {
+    if (selectedSubCategory) {
+      await requestCategoryDeletion(selectedSubCategory);
+      info = getCategoryInfo(data.id, $masterKeyStore?.get(1)?.key!); // TODO: FIXME
+      return true;
+    }
+    return false;
+  }}
+/>
diff --git a/src/routes/(main)/category/[[id]]/CategoryMenuBottomSheet.svelte b/src/routes/(main)/category/[[id]]/CategoryMenuBottomSheet.svelte
new file mode 100644
index 0000000..200501e
--- /dev/null
+++ b/src/routes/(main)/category/[[id]]/CategoryMenuBottomSheet.svelte
@@ -0,0 +1,57 @@
+<script lang="ts">
+  import { BottomSheet } from "$lib/components";
+  import { EntryButton } from "$lib/components/buttons";
+  import type { SelectedCategory } from "$lib/molecules/Categories";
+
+  import IconCategory from "~icons/material-symbols/category";
+  import IconEdit from "~icons/material-symbols/edit";
+  import IconDelete from "~icons/material-symbols/delete";
+
+  interface Props {
+    onRenameClick: () => void;
+    onDeleteClick: () => void;
+    isOpen: boolean;
+    selectedCategory: SelectedCategory | undefined;
+  }
+
+  let {
+    onRenameClick,
+    onDeleteClick,
+    isOpen = $bindable(),
+    selectedCategory = $bindable(),
+  }: Props = $props();
+
+  const closeBottomSheet = () => {
+    isOpen = false;
+    selectedCategory = undefined;
+  };
+</script>
+
+<BottomSheet bind:isOpen onclose={closeBottomSheet}>
+  <div class="w-full py-4">
+    {#if selectedCategory}
+      {@const { name } = selectedCategory}
+      <div class="flex h-12 items-center gap-x-4 p-2">
+        <div class="flex-shrink-0 text-lg">
+          <IconCategory />
+        </div>
+        <p title={name} class="flex-grow truncate font-semibold">
+          {name}
+        </p>
+      </div>
+      <div class="my-2 h-px w-full bg-gray-200"></div>
+    {/if}
+    <EntryButton onclick={onRenameClick}>
+      <div class="flex h-8 items-center gap-x-4">
+        <IconEdit class="text-lg" />
+        <p class="font-medium">이름 바꾸기</p>
+      </div>
+    </EntryButton>
+    <EntryButton onclick={onDeleteClick}>
+      <div class="flex h-8 items-center gap-x-4 text-red-500">
+        <IconDelete class="text-lg" />
+        <p class="font-medium">삭제하기</p>
+      </div>
+    </EntryButton>
+  </div>
+</BottomSheet>
diff --git a/src/routes/(main)/category/[[id]]/DeleteCategoryModal.svelte b/src/routes/(main)/category/[[id]]/DeleteCategoryModal.svelte
new file mode 100644
index 0000000..880cbda
--- /dev/null
+++ b/src/routes/(main)/category/[[id]]/DeleteCategoryModal.svelte
@@ -0,0 +1,55 @@
+<script lang="ts">
+  import { Modal } from "$lib/components";
+  import { Button } from "$lib/components/buttons";
+  import type { SelectedCategory } from "$lib/molecules/Categories";
+
+  interface Props {
+    onDeleteClick: () => Promise<boolean>;
+    isOpen: boolean;
+    selectedCategory: SelectedCategory | undefined;
+  }
+
+  let { onDeleteClick, isOpen = $bindable(), selectedCategory = $bindable() }: Props = $props();
+
+  const closeModal = () => {
+    isOpen = false;
+    selectedCategory = undefined;
+  };
+
+  const deleteEntry = async () => {
+    // TODO: Validation
+
+    if (await onDeleteClick()) {
+      closeModal();
+    }
+  };
+</script>
+
+<Modal bind:isOpen onclose={closeModal}>
+  {#if selectedCategory}
+    {@const { name } = selectedCategory}
+    {@const nameShort = name.length > 20 ? `${name.slice(0, 20)}...` : name}
+    <div class="space-y-4">
+      <div class="space-y-2 break-keep">
+        <p class="text-xl font-bold">
+          '{nameShort}' 카테고리를 삭제할까요?
+        </p>
+        <p>
+          모든 하위 카테고리도 함께 삭제돼요. <br />
+          하지만 카테고리에 추가된 파일들은 삭제되지 않아요.
+        </p>
+      </div>
+      <div class="flex gap-2">
+        <Button
+          color="gray"
+          onclick={() => {
+            isOpen = false;
+          }}
+        >
+          아니요
+        </Button>
+        <Button onclick={deleteEntry}>삭제할게요</Button>
+      </div>
+    </div>
+  {/if}
+</Modal>
diff --git a/src/routes/(main)/category/[[id]]/RenameCategoryModal.svelte b/src/routes/(main)/category/[[id]]/RenameCategoryModal.svelte
new file mode 100644
index 0000000..dbb13c6
--- /dev/null
+++ b/src/routes/(main)/category/[[id]]/RenameCategoryModal.svelte
@@ -0,0 +1,47 @@
+<script lang="ts">
+  import { Modal } from "$lib/components";
+  import { Button } from "$lib/components/buttons";
+  import { TextInput } from "$lib/components/inputs";
+  import type { SelectedCategory } from "$lib/molecules/Categories";
+
+  interface Props {
+    onRenameClick: (newName: string) => Promise<boolean>;
+    isOpen: boolean;
+    selectedCategory: SelectedCategory | undefined;
+  }
+
+  let { onRenameClick, isOpen = $bindable(), selectedCategory = $bindable() }: Props = $props();
+
+  let name = $state("");
+
+  const closeModal = () => {
+    name = "";
+    isOpen = false;
+    selectedCategory = undefined;
+  };
+
+  const renameEntry = async () => {
+    // TODO: Validation
+
+    if (await onRenameClick(name)) {
+      closeModal();
+    }
+  };
+
+  $effect(() => {
+    if (selectedCategory) {
+      name = selectedCategory.name;
+    }
+  });
+</script>
+
+<Modal bind:isOpen onclose={closeModal}>
+  <p class="text-xl font-bold">이름 바꾸기</p>
+  <div class="mt-2 flex w-full">
+    <TextInput bind:value={name} placeholder="이름" />
+  </div>
+  <div class="mt-7 flex gap-2">
+    <Button color="gray" onclick={closeModal}>닫기</Button>
+    <Button onclick={renameEntry}>바꾸기</Button>
+  </div>
+</Modal>
diff --git a/src/routes/(main)/category/[[id]]/service.ts b/src/routes/(main)/category/[[id]]/service.ts
index c2018ed..8a5d9f8 100644
--- a/src/routes/(main)/category/[[id]]/service.ts
+++ b/src/routes/(main)/category/[[id]]/service.ts
@@ -1,21 +1,22 @@
 import { callPostApi } from "$lib/hooks";
-import { generateDataKey, wrapDataKey, encryptString } from "$lib/modules/crypto";
-import type { CategoryCreateRequest } from "$lib/server/schemas";
-import type { MasterKey } from "$lib/stores";
+import { encryptString } from "$lib/modules/crypto";
+import type { SelectedCategory } from "$lib/molecules/Categories";
+import type { CategoryRenameRequest } from "$lib/server/schemas";
 
-export const requestCategoryCreation = async (
-  name: string,
-  parentId: "root" | number,
-  masterKey: MasterKey,
-) => {
-  const { dataKey, dataKeyVersion } = await generateDataKey();
-  const nameEncrypted = await encryptString(name, dataKey);
-  await callPostApi<CategoryCreateRequest>("/api/category/create", {
-    parent: parentId,
-    mekVersion: masterKey.version,
-    dek: await wrapDataKey(dataKey, masterKey.key),
-    dekVersion: dataKeyVersion.toISOString(),
-    name: nameEncrypted.ciphertext,
-    nameIv: nameEncrypted.iv,
+export { requestCategoryCreation } from "$lib/services/category";
+
+export const requestCategoryRename = async (category: SelectedCategory, newName: string) => {
+  const newNameEncrypted = await encryptString(newName, category.dataKey);
+
+  const res = await callPostApi<CategoryRenameRequest>(`/api/category/${category.id}/rename`, {
+    dekVersion: category.dataKeyVersion.toISOString(),
+    name: newNameEncrypted.ciphertext,
+    nameIv: newNameEncrypted.iv,
   });
+  return res.ok;
+};
+
+export const requestCategoryDeletion = async (category: SelectedCategory) => {
+  const res = await callPostApi(`/api/category/${category.id}/delete`);
+  return res.ok;
 };
diff --git a/src/routes/api/category/[id]/delete/+server.ts b/src/routes/api/category/[id]/delete/+server.ts
new file mode 100644
index 0000000..cbbe356
--- /dev/null
+++ b/src/routes/api/category/[id]/delete/+server.ts
@@ -0,0 +1,20 @@
+import { error, text } from "@sveltejs/kit";
+import { z } from "zod";
+import { authorize } from "$lib/server/modules/auth";
+import { deleteCategory } from "$lib/server/services/category";
+import type { RequestHandler } from "./$types";
+
+export const POST: RequestHandler = async ({ locals, params }) => {
+  const { userId } = await authorize(locals, "activeClient");
+
+  const zodRes = z
+    .object({
+      id: z.coerce.number().int().positive(),
+    })
+    .safeParse(params);
+  if (!zodRes.success) error(400, "Invalid path parameters");
+  const { id } = zodRes.data;
+
+  await deleteCategory(userId, id);
+  return text("Category deleted", { headers: { "Content-Type": "text/plain" } });
+};
diff --git a/src/routes/api/category/[id]/file/remove/+server.ts b/src/routes/api/category/[id]/file/remove/+server.ts
new file mode 100644
index 0000000..6fdcccf
--- /dev/null
+++ b/src/routes/api/category/[id]/file/remove/+server.ts
@@ -0,0 +1,25 @@
+import { error, text } from "@sveltejs/kit";
+import { z } from "zod";
+import { authorize } from "$lib/server/modules/auth";
+import { categoryFileRemoveRequest } from "$lib/server/schemas";
+import { removeCategoryFile } from "$lib/server/services/category";
+import type { RequestHandler } from "./$types";
+
+export const POST: RequestHandler = async ({ locals, params, request }) => {
+  const { userId } = await authorize(locals, "activeClient");
+
+  const paramsZodRes = z
+    .object({
+      id: z.coerce.number().int().positive(),
+    })
+    .safeParse(params);
+  if (!paramsZodRes.success) error(400, "Invalid path parameters");
+  const { id } = paramsZodRes.data;
+
+  const bodyZodRes = categoryFileRemoveRequest.safeParse(await request.json());
+  if (!bodyZodRes.success) error(400, "Invalid request body");
+  const { file } = bodyZodRes.data;
+
+  await removeCategoryFile(userId, id, file);
+  return text("File removed", { headers: { "Content-Type": "text/plain" } });
+};
diff --git a/src/routes/api/category/[id]/rename/+server.ts b/src/routes/api/category/[id]/rename/+server.ts
new file mode 100644
index 0000000..5351544
--- /dev/null
+++ b/src/routes/api/category/[id]/rename/+server.ts
@@ -0,0 +1,25 @@
+import { error, text } from "@sveltejs/kit";
+import { z } from "zod";
+import { authorize } from "$lib/server/modules/auth";
+import { categoryRenameRequest } from "$lib/server/schemas";
+import { renameCategory } from "$lib/server/services/category";
+import type { RequestHandler } from "./$types";
+
+export const POST: RequestHandler = async ({ locals, params, request }) => {
+  const { userId } = await authorize(locals, "activeClient");
+
+  const paramsZodRes = z
+    .object({
+      id: z.coerce.number().int().positive(),
+    })
+    .safeParse(params);
+  if (!paramsZodRes.success) error(400, "Invalid path parameters");
+  const { id } = paramsZodRes.data;
+
+  const bodyZodRes = categoryRenameRequest.safeParse(await request.json());
+  if (!bodyZodRes.success) error(400, "Invalid request body");
+  const { dekVersion, name, nameIv } = bodyZodRes.data;
+
+  await renameCategory(userId, id, new Date(dekVersion), { ciphertext: name, iv: nameIv });
+  return text("Category renamed", { headers: { "Content-Type": "text/plain" } });
+};