diff --git a/CHANGELOG.md b/CHANGELOG.md
index 865684aa20..efd07da891 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@
 - Enhance: Goneを出さずに終了したサーバーへの配信停止を自動的に行うように
   - もしそのようなサーバーからから配信が届いた場合には自動的に配信を再開します
 - Enhance: 配信停止の理由を表示するように
+- Enhance: サーバーのお問い合わせ先URLを設定できるようになりました
 - Fix: Play作成時に設定した公開範囲が機能していない問題を修正
 - Fix: 正規化されていない状態のhashtagが連合されてきたhtmlに含まれているとhashtagが正しくhashtagに復元されない問題を修正
 - Fix: みつけるのアンケート欄にてチャンネルのアンケートが含まれてしまう問題を修正
diff --git a/locales/index.d.ts b/locales/index.d.ts
index d4ded0bb5b..91bbe4ccb6 100644
--- a/locales/index.d.ts
+++ b/locales/index.d.ts
@@ -5471,6 +5471,14 @@ export interface Locale extends ILocale {
          * 有効にすると、タイムラインがキャッシュされていない場合にDBへ追加で問い合わせを行うフォールバック処理を行います。無効にすると、フォールバック処理を行わないことでさらにサーバーの負荷を軽減することができますが、タイムラインが取得できる範囲に制限が生じます。
          */
         "fanoutTimelineDbFallbackDescription": string;
+        /**
+         * 問い合わせ先URL
+         */
+        "inquiryUrl": string;
+        /**
+         * サーバー運営者へのお問い合わせフォームのURLや、運営者の連絡先等が記載されたWebページのURLを指定します。
+         */
+        "inquiryUrlDescription": string;
     };
     "_accountMigration": {
         /**
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index d7ceb971af..b7083b4942 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -1383,6 +1383,8 @@ _serverSettings:
   fanoutTimelineDescription: "有効にすると、各種タイムラインを取得する際のパフォーマンスが大幅に向上し、データベースへの負荷を軽減することが可能です。ただし、Redisのメモリ使用量は増加します。サーバーのメモリ容量が少ない場合、または動作が不安定な場合は無効にすることができます。"
   fanoutTimelineDbFallback: "データベースへのフォールバック"
   fanoutTimelineDbFallbackDescription: "有効にすると、タイムラインがキャッシュされていない場合にDBへ追加で問い合わせを行うフォールバック処理を行います。無効にすると、フォールバック処理を行わないことでさらにサーバーの負荷を軽減することができますが、タイムラインが取得できる範囲に制限が生じます。"
+  inquiryUrl: "問い合わせ先URL"
+  inquiryUrlDescription: "サーバー運営者へのお問い合わせフォームのURLや、運営者の連絡先等が記載されたWebページのURLを指定します。"
 
 _accountMigration:
   moveFrom: "別のアカウントからこのアカウントに移行"
diff --git a/packages/backend/migration/1717117195275-inquiryUrl.js b/packages/backend/migration/1717117195275-inquiryUrl.js
new file mode 100644
index 0000000000..3834df06d4
--- /dev/null
+++ b/packages/backend/migration/1717117195275-inquiryUrl.js
@@ -0,0 +1,20 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export class InquiryUrl1717117195275 {
+    name = 'InquiryUrl1717117195275'
+
+    async up(queryRunner) {
+        await queryRunner.query(`ALTER TABLE "meta" RENAME COLUMN "trustedLinkUrlPatterns" TO "inquiryUrl"`);
+        await queryRunner.query(`ALTER TABLE "meta" DROP COLUMN "inquiryUrl"`);
+        await queryRunner.query(`ALTER TABLE "meta" ADD "inquiryUrl" character varying(1024)`);
+    }
+
+    async down(queryRunner) {
+        await queryRunner.query(`ALTER TABLE "meta" DROP COLUMN "inquiryUrl"`);
+        await queryRunner.query(`ALTER TABLE "meta" ADD "inquiryUrl" character varying(3072) array NOT NULL DEFAULT '{}'`);
+        await queryRunner.query(`ALTER TABLE "meta" RENAME COLUMN "inquiryUrl" TO "trustedLinkUrlPatterns"`);
+    }
+}
diff --git a/packages/backend/src/core/entities/MetaEntityService.ts b/packages/backend/src/core/entities/MetaEntityService.ts
index 9d054ab6a1..5dfec589e1 100644
--- a/packages/backend/src/core/entities/MetaEntityService.ts
+++ b/packages/backend/src/core/entities/MetaEntityService.ts
@@ -67,6 +67,7 @@ export class MetaEntityService {
 			feedbackUrl: instance.feedbackUrl,
 			impressumUrl: instance.impressumUrl,
 			privacyPolicyUrl: instance.privacyPolicyUrl,
+			inquiryUrl: instance.inquiryUrl,
 			disableRegistration: instance.disableRegistration,
 			emailRequiredForSignup: instance.emailRequiredForSignup,
 			enableHcaptcha: instance.enableHcaptcha,
diff --git a/packages/backend/src/models/Meta.ts b/packages/backend/src/models/Meta.ts
index 04a34bbbb4..ad306fcad6 100644
--- a/packages/backend/src/models/Meta.ts
+++ b/packages/backend/src/models/Meta.ts
@@ -376,6 +376,12 @@ export class MiMeta {
 	})
 	public privacyPolicyUrl: string | null;
 
+	@Column('varchar', {
+		length: 1024,
+		nullable: true,
+	})
+	public inquiryUrl: string | null;
+
 	@Column('varchar', {
 		length: 8192,
 		nullable: true,
diff --git a/packages/backend/src/models/json-schema/meta.ts b/packages/backend/src/models/json-schema/meta.ts
index 473339a1ad..e7bc6356e5 100644
--- a/packages/backend/src/models/json-schema/meta.ts
+++ b/packages/backend/src/models/json-schema/meta.ts
@@ -227,6 +227,10 @@ export const packedMetaLiteSchema = {
 			type: 'string',
 			optional: false, nullable: true,
 		},
+		inquiryUrl: {
+			type: 'string',
+			optional: false, nullable: true,
+		},
 		serverRules: {
 			type: 'array',
 			optional: false, nullable: false,
diff --git a/packages/backend/src/server/NodeinfoServerService.ts b/packages/backend/src/server/NodeinfoServerService.ts
index c1e5af08c9..cc18997fdc 100644
--- a/packages/backend/src/server/NodeinfoServerService.ts
+++ b/packages/backend/src/server/NodeinfoServerService.ts
@@ -37,12 +37,12 @@ export class NodeinfoServerService {
 	@bindThis
 	public getLinks() {
 		return [{
-				rel: 'http://nodeinfo.diaspora.software/ns/schema/2.1',
-				href: this.config.url + nodeinfo2_1path
-			}, {
-				rel: 'http://nodeinfo.diaspora.software/ns/schema/2.0',
-				href: this.config.url + nodeinfo2_0path,
-			}];
+			rel: 'http://nodeinfo.diaspora.software/ns/schema/2.1',
+			href: this.config.url + nodeinfo2_1path,
+		}, {
+			rel: 'http://nodeinfo.diaspora.software/ns/schema/2.0',
+			href: this.config.url + nodeinfo2_0path,
+		}];
 	}
 
 	@bindThis
@@ -108,6 +108,7 @@ export class NodeinfoServerService {
 					langs: meta.langs,
 					tosUrl: meta.termsOfServiceUrl,
 					privacyPolicyUrl: meta.privacyPolicyUrl,
+					inquiryUrl: meta.inquiryUrl,
 					impressumUrl: meta.impressumUrl,
 					repositoryUrl: meta.repositoryUrl,
 					feedbackUrl: meta.feedbackUrl,
diff --git a/packages/backend/src/server/api/endpoints/admin/meta.ts b/packages/backend/src/server/api/endpoints/admin/meta.ts
index f4ff573271..eee02a7123 100644
--- a/packages/backend/src/server/api/endpoints/admin/meta.ts
+++ b/packages/backend/src/server/api/endpoints/admin/meta.ts
@@ -427,6 +427,10 @@ export const meta = {
 				type: 'string',
 				optional: false, nullable: true,
 			},
+			inquiryUrl: {
+				type: 'string',
+				optional: false, nullable: true,
+			},
 			repositoryUrl: {
 				type: 'string',
 				optional: false, nullable: true,
@@ -513,6 +517,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				feedbackUrl: instance.feedbackUrl,
 				impressumUrl: instance.impressumUrl,
 				privacyPolicyUrl: instance.privacyPolicyUrl,
+				inquiryUrl: instance.inquiryUrl,
 				disableRegistration: instance.disableRegistration,
 				emailRequiredForSignup: instance.emailRequiredForSignup,
 				enableHcaptcha: instance.enableHcaptcha,
diff --git a/packages/backend/src/server/api/endpoints/admin/update-meta.ts b/packages/backend/src/server/api/endpoints/admin/update-meta.ts
index 2f62d30ada..4e28ee6877 100644
--- a/packages/backend/src/server/api/endpoints/admin/update-meta.ts
+++ b/packages/backend/src/server/api/endpoints/admin/update-meta.ts
@@ -107,6 +107,7 @@ export const paramDef = {
 		feedbackUrl: { type: 'string', nullable: true },
 		impressumUrl: { type: 'string', nullable: true },
 		privacyPolicyUrl: { type: 'string', nullable: true },
+		inquiryUrl: { type: 'string', nullable: true },
 		useObjectStorage: { type: 'boolean' },
 		objectStorageBaseUrl: { type: 'string', nullable: true },
 		objectStorageBucket: { type: 'string', nullable: true },
@@ -422,6 +423,10 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				set.privacyPolicyUrl = ps.privacyPolicyUrl;
 			}
 
+			if (ps.inquiryUrl !== undefined) {
+				set.inquiryUrl = ps.inquiryUrl;
+			}
+
 			if (ps.useObjectStorage !== undefined) {
 				set.useObjectStorage = ps.useObjectStorage;
 			}
diff --git a/packages/frontend/src/pages/admin/moderation.vue b/packages/frontend/src/pages/admin/moderation.vue
index 9efb34ac9a..a75799696d 100644
--- a/packages/frontend/src/pages/admin/moderation.vue
+++ b/packages/frontend/src/pages/admin/moderation.vue
@@ -30,6 +30,12 @@ SPDX-License-Identifier: AGPL-3.0-only
 						<template #label>{{ i18n.ts.privacyPolicyUrl }}</template>
 					</MkInput>
 
+					<MkInput v-model="inquiryUrl" type="url">
+						<template #prefix><i class="ti ti-link"></i></template>
+						<template #label>{{ i18n.ts._serverSettings.inquiryUrl }}</template>
+						<template #caption>{{ i18n.ts._serverSettings.inquiryUrlDescription }}</template>
+					</MkInput>
+
 					<MkTextarea v-model="preservedUsernames">
 						<template #label>{{ i18n.ts.preservedUsernames }}</template>
 						<template #caption>{{ i18n.ts.preservedUsernamesDescription }}</template>
@@ -86,6 +92,7 @@ const hiddenTags = ref<string>('');
 const preservedUsernames = ref<string>('');
 const tosUrl = ref<string | null>(null);
 const privacyPolicyUrl = ref<string | null>(null);
+const inquiryUrl = ref<string | null>(null);
 
 async function init() {
 	const meta = await misskeyApi('admin/meta');
@@ -97,6 +104,7 @@ async function init() {
 	preservedUsernames.value = meta.preservedUsernames.join('\n');
 	tosUrl.value = meta.tosUrl;
 	privacyPolicyUrl.value = meta.privacyPolicyUrl;
+	inquiryUrl.value = meta.inquiryUrl;
 }
 
 function save() {
@@ -105,6 +113,7 @@ function save() {
 		emailRequiredForSignup: emailRequiredForSignup.value,
 		tosUrl: tosUrl.value,
 		privacyPolicyUrl: privacyPolicyUrl.value,
+		inquiryUrl: inquiryUrl.value,
 		sensitiveWords: sensitiveWords.value.split('\n'),
 		prohibitedWords: prohibitedWords.value.split('\n'),
 		hiddenTags: hiddenTags.value.split('\n'),
diff --git a/packages/frontend/src/pages/contact.vue b/packages/frontend/src/pages/contact.vue
index 3a694a7132..bcdcf43275 100644
--- a/packages/frontend/src/pages/contact.vue
+++ b/packages/frontend/src/pages/contact.vue
@@ -7,7 +7,21 @@ SPDX-License-Identifier: AGPL-3.0-only
 <MkStickyContainer>
 	<template #header><MkPageHeader/></template>
 	<MkSpacer :contentMax="600" :marginMin="20">
-		<div>{{ instance.maintainerEmail }}</div>
+		<div class="_gaps">
+			<MkKeyValue>
+				<template #key>{{ i18n.ts.inquiry }}</template>
+				<template #value>
+					<MkLink :url="instance.inquiryUrl" target="_blank">{{ instance.inquiryUrl }}</MkLink>
+				</template>
+			</MkKeyValue>
+
+			<MkKeyValue>
+				<template #key>{{ i18n.ts.email }}</template>
+				<template #value>
+					<div>{{ instance.maintainerEmail }}</div>
+				</template>
+			</MkKeyValue>
+		</div>
 	</MkSpacer>
 </MkStickyContainer>
 </template>
@@ -16,6 +30,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 import { i18n } from '@/i18n.js';
 import { definePageMetadata } from '@/scripts/page-metadata.js';
 import { instance } from '@/instance.js';
+import MkKeyValue from '@/components/MkKeyValue.vue';
+import MkLink from '@/components/MkLink.vue';
 
 definePageMetadata(() => ({
 	title: i18n.ts.inquiry,
diff --git a/packages/misskey-js/src/autogen/types.ts b/packages/misskey-js/src/autogen/types.ts
index 11567677c9..9beb49fb64 100644
--- a/packages/misskey-js/src/autogen/types.ts
+++ b/packages/misskey-js/src/autogen/types.ts
@@ -4831,6 +4831,7 @@ export type components = {
       impressumUrl: string | null;
       logoImageUrl: string | null;
       privacyPolicyUrl: string | null;
+      inquiryUrl: string | null;
       serverRules: string[];
       themeColor: string | null;
       policies: components['schemas']['RolePolicies'];
@@ -4978,6 +4979,7 @@ export type operations = {
             shortName: string | null;
             objectStorageS3ForcePathStyle: boolean;
             privacyPolicyUrl: string | null;
+            inquiryUrl: string | null;
             repositoryUrl: string | null;
             /**
              * @deprecated
@@ -8906,6 +8908,7 @@ export type operations = {
           feedbackUrl?: string | null;
           impressumUrl?: string | null;
           privacyPolicyUrl?: string | null;
+          inquiryUrl?: string | null;
           useObjectStorage?: boolean;
           objectStorageBaseUrl?: string | null;
           objectStorageBucket?: string | null;