diff --git a/CHANGELOG.md b/CHANGELOG.md
index 88adeca87b..0c1d49f2e5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@ You should also include the user name that made the change.
 
 ### Improvements
 - インスタンスデフォルトテーマを設定できるように @syuilo
+- ミュートに期限を設定できるように @syuilo
 - プロフィールの追加情報を最大16まで保存できるように @syuilo
 - 連合チャートにPub&Subを追加 @syuilo
 - デフォルトで10秒以上時間がかかるデータベースへのクエリは中断されるように @syuilo
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 90dc14815e..8f48c2940c 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -834,6 +834,12 @@ searchByGoogle: "ググる"
 instanceDefaultLightTheme: "インスタンスデフォルトのライトテーマ"
 instanceDefaultDarkTheme: "インスタンスデフォルトのダークテーマ"
 instanceDefaultThemeDescription: "オブジェクト形式のテーマコードを記入します。"
+mutePeriod: "ミュートする期限"
+indefinitely: "無期限"
+tenMinutes: "10分"
+oneHour: "1時間"
+oneDay: "1日"
+oneWeek: "1週間"
 
 _emailUnavailable:
   used: "既に使用されています"
diff --git a/packages/backend/migration/1646387162108-mute-expires-at.js b/packages/backend/migration/1646387162108-mute-expires-at.js
new file mode 100644
index 0000000000..c8be8f3c54
--- /dev/null
+++ b/packages/backend/migration/1646387162108-mute-expires-at.js
@@ -0,0 +1,13 @@
+export class muteExpiresAt1646387162108 {
+    name = 'muteExpiresAt1646387162108'
+
+    async up(queryRunner) {
+        await queryRunner.query(`ALTER TABLE "muting" ADD "expiresAt" TIMESTAMP WITH TIME ZONE`);
+        await queryRunner.query(`CREATE INDEX "IDX_c1fd1c3dfb0627aa36c253fd14" ON "muting" ("expiresAt") `);
+    }
+
+    async down(queryRunner) {
+        await queryRunner.query(`DROP INDEX "public"."IDX_c1fd1c3dfb0627aa36c253fd14"`);
+        await queryRunner.query(`ALTER TABLE "muting" DROP COLUMN "expiresAt"`);
+    }
+}
diff --git a/packages/backend/src/models/entities/muting.ts b/packages/backend/src/models/entities/muting.ts
index 8cdd2af9d1..b3a7e7a671 100644
--- a/packages/backend/src/models/entities/muting.ts
+++ b/packages/backend/src/models/entities/muting.ts
@@ -14,6 +14,13 @@ export class Muting {
 	})
 	public createdAt: Date;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		nullable: true,
+		default: null,
+	})
+	public expiresAt: Date | null;
+
 	@Index()
 	@Column({
 		...id(),
diff --git a/packages/backend/src/models/repositories/muting.ts b/packages/backend/src/models/repositories/muting.ts
index 6ffecc302a..643e0b68ee 100644
--- a/packages/backend/src/models/repositories/muting.ts
+++ b/packages/backend/src/models/repositories/muting.ts
@@ -16,6 +16,7 @@ export class MutingRepository extends Repository<Muting> {
 		return await awaitAll({
 			id: muting.id,
 			createdAt: muting.createdAt.toISOString(),
+			expiresAt: muting.expiresAt ? muting.expiresAt.toISOString() : null,
 			muteeId: muting.muteeId,
 			mutee: Users.pack(muting.muteeId, me, {
 				detail: true,
diff --git a/packages/backend/src/models/schema/muting.ts b/packages/backend/src/models/schema/muting.ts
index d75a4fbfed..3ab99e17e7 100644
--- a/packages/backend/src/models/schema/muting.ts
+++ b/packages/backend/src/models/schema/muting.ts
@@ -12,6 +12,11 @@ export const packedMutingSchema = {
 			optional: false, nullable: false,
 			format: 'date-time',
 		},
+		expiresAt: {
+			type: 'string',
+			optional: false, nullable: true,
+			format: 'date-time',
+		},
 		muteeId: {
 			type: 'string',
 			optional: false, nullable: false,
diff --git a/packages/backend/src/queue/index.ts b/packages/backend/src/queue/index.ts
index 94055e9c5a..1b1c21c4f0 100644
--- a/packages/backend/src/queue/index.ts
+++ b/packages/backend/src/queue/index.ts
@@ -273,6 +273,11 @@ export default function() {
 		repeat: { cron: '0 0 * * *' },
 	});
 
+	systemQueue.add('checkExpiredMutings', {
+	}, {
+		repeat: { cron: '*/5 * * * *' },
+	});
+
 	processSystemQueue(systemQueue);
 }
 
diff --git a/packages/backend/src/queue/processors/db/export-mute.ts b/packages/backend/src/queue/processors/db/export-mute.ts
index 8602e00bff..9fb144abb2 100644
--- a/packages/backend/src/queue/processors/db/export-mute.ts
+++ b/packages/backend/src/queue/processors/db/export-mute.ts
@@ -7,7 +7,7 @@ import { addFile } from '@/services/drive/add-file.js';
 import { format as dateFormat } from 'date-fns';
 import { getFullApAccount } from '@/misc/convert-host.js';
 import { Users, Mutings } from '@/models/index.js';
-import { MoreThan } from 'typeorm';
+import { IsNull, MoreThan } from 'typeorm';
 import { DbUserJobData } from '@/queue/types.js';
 
 const logger = queueLogger.createSubLogger('export-mute');
@@ -40,6 +40,7 @@ export async function exportMute(job: Bull.Job<DbUserJobData>, done: any): Promi
 		const mutes = await Mutings.find({
 			where: {
 				muterId: user.id,
+				expiresAt: IsNull(),
 				...(cursor ? { id: MoreThan(cursor) } : {}),
 			},
 			take: 100,
diff --git a/packages/backend/src/queue/processors/system/check-expired-mutings.ts b/packages/backend/src/queue/processors/system/check-expired-mutings.ts
new file mode 100644
index 0000000000..621269e7e1
--- /dev/null
+++ b/packages/backend/src/queue/processors/system/check-expired-mutings.ts
@@ -0,0 +1,30 @@
+import Bull from 'bull';
+import { In } from 'typeorm';
+import { Mutings } from '@/models/index.js';
+import { queueLogger } from '../../logger.js';
+import { publishUserEvent } from '@/services/stream.js';
+
+const logger = queueLogger.createSubLogger('check-expired-mutings');
+
+export async function checkExpiredMutings(job: Bull.Job<Record<string, unknown>>, done: any): Promise<void> {
+	logger.info(`Checking expired mutings...`);
+
+	const expired = await Mutings.createQueryBuilder('muting')
+		.where('muting.expiresAt IS NOT NULL')
+		.andWhere('muting.expiresAt < :now', { now: new Date() })
+		.innerJoinAndSelect('muting.mutee', 'mutee')
+		.getMany();
+
+	if (expired.length > 0) {
+		await Mutings.delete({
+			id: In(expired.map(m => m.id)),
+		});
+
+		for (const m of expired) {
+			publishUserEvent(m.muterId, 'unmute', m.mutee!);
+		}
+	}
+
+	logger.succ(`All expired mutings checked.`);
+	done();
+}
diff --git a/packages/backend/src/queue/processors/system/index.ts b/packages/backend/src/queue/processors/system/index.ts
index dca3249e82..f90f6efafd 100644
--- a/packages/backend/src/queue/processors/system/index.ts
+++ b/packages/backend/src/queue/processors/system/index.ts
@@ -2,11 +2,13 @@ import Bull from 'bull';
 import { tickCharts } from './tick-charts.js';
 import { resyncCharts } from './resync-charts.js';
 import { cleanCharts } from './clean-charts.js';
+import { checkExpiredMutings } from './check-expired-mutings.js';
 
 const jobs = {
 	tickCharts,
 	resyncCharts,
 	cleanCharts,
+	checkExpiredMutings,
 } as Record<string, Bull.ProcessCallbackFunction<Record<string, unknown>> | Bull.ProcessPromiseFunction<Record<string, unknown>>>;
 
 export default function(dbQueue: Bull.Queue<Record<string, unknown>>) {
diff --git a/packages/backend/src/server/api/endpoints/mute/create.ts b/packages/backend/src/server/api/endpoints/mute/create.ts
index 0178aab143..dacee40d01 100644
--- a/packages/backend/src/server/api/endpoints/mute/create.ts
+++ b/packages/backend/src/server/api/endpoints/mute/create.ts
@@ -38,6 +38,7 @@ export const paramDef = {
 	type: 'object',
 	properties: {
 		userId: { type: 'string', format: 'misskey:id' },
+		expiresAt: { type: 'integer', nullable: true },
 	},
 	required: ['userId'],
 } as const;
@@ -67,10 +68,15 @@ export default define(meta, paramDef, async (ps, user) => {
 		throw new ApiError(meta.errors.alreadyMuting);
 	}
 
+	if (ps.expiresAt && ps.expiresAt <= Date.now()) {
+		return;
+	}
+
 	// Create mute
 	await Mutings.insert({
 		id: genId(),
 		createdAt: new Date(),
+		expiresAt: ps.expiresAt ? new Date(ps.expiresAt) : null,
 		muterId: muter.id,
 		muteeId: mutee.id,
 	} as Muting);
diff --git a/packages/client/src/scripts/get-user-menu.ts b/packages/client/src/scripts/get-user-menu.ts
index 6d1f25a942..192d14b83e 100644
--- a/packages/client/src/scripts/get-user-menu.ts
+++ b/packages/client/src/scripts/get-user-menu.ts
@@ -56,11 +56,44 @@ export function getUserMenu(user) {
 	}
 
 	async function toggleMute() {
-		os.apiWithDialog(user.isMuted ? 'mute/delete' : 'mute/create', {
-			userId: user.id
-		}).then(() => {
-			user.isMuted = !user.isMuted;
-		});
+		if (user.isMuted) {
+			os.apiWithDialog('mute/delete', {
+				userId: user.id,
+			}).then(() => {
+				user.isMuted = false;
+			});
+		} else {
+			const { canceled, result: period } = await os.select({
+				title: i18n.ts.mutePeriod,
+				items: [{
+					value: 'indefinitely', text: i18n.ts.indefinitely,
+				}, {
+					value: 'tenMinutes', text: i18n.ts.tenMinutes,
+				}, {
+					value: 'oneHour', text: i18n.ts.oneHour,
+				}, {
+					value: 'oneDay', text: i18n.ts.oneDay,
+				}, {
+					value: 'oneWeek', text: i18n.ts.oneWeek,
+				}],
+				default: 'indefinitely',
+			});
+			if (canceled) return;
+
+			const expiresAt = period === 'indefinitely' ? null
+				: period === 'tenMinutes' ? Date.now() + (1000 * 60 * 10)
+				: period === 'oneHour' ? Date.now() + (1000 * 60 * 60)
+				: period === 'oneDay' ? Date.now() + (1000 * 60 * 60 * 24)
+				: period === 'oneWeek' ? Date.now() + (1000 * 60 * 60 * 24 * 7)
+				: null;
+
+			os.apiWithDialog('mute/create', {
+				userId: user.id,
+				expiresAt,
+			}).then(() => {
+				user.isMuted = true;
+			});
+		}
 	}
 
 	async function toggleBlock() {