diff --git a/locales/en-US.yml b/locales/en-US.yml
index 86567cb75173..7c484a8e979a 100644
--- a/locales/en-US.yml
+++ b/locales/en-US.yml
@@ -37,6 +37,7 @@ signup: "Sign Up"
 uploading: "Uploading..."
 save: "Save"
 users: "Users"
+approvals: "Approvals"
 addUser: "Add a user"
 favorite: "Add to favorites"
 favorites: "Favorites"
@@ -152,6 +153,8 @@ unsuspend: "Unsuspend"
 blockConfirm: "Are you sure that you want to block this account?"
 unblockConfirm: "Are you sure that you want to unblock this account?"
 suspendConfirm: "Are you sure that you want to suspend this account?"
+registerApproveConfirm: "Are you sure that you want to approve this account?"
+registerApproveConfirmDescription: "This action cannot be undone. An email notification will be sent to the user."
 unsuspendConfirm: "Are you sure that you want to unsuspend this account?"
 selectList: "Select a list"
 editList: "Edit list"
@@ -909,6 +912,8 @@ itsOff: "Disabled"
 on: "On"
 off: "Off"
 emailRequiredForSignup: "Require email address for sign-up"
+approvalRequiredForSignup: "Manual approval required for sign-up"
+signupPendingApprovals: "Pending Approvals"
 unread: "Unread"
 filter: "Filter"
 controlPanel: "Control Panel"
@@ -963,6 +968,7 @@ recentNHours: "Last {n} hours"
 recentNDays: "Last {n} days"
 noEmailServerWarning: "Email server not configured."
 thereIsUnresolvedAbuseReportWarning: "There are unsolved reports."
+pendingUserApprovals: "There are accounts waiting for approvals."
 recommended: "Recommended"
 check: "Check"
 driveCapOverrideLabel: "Change the drive capacity for this user"
@@ -971,6 +977,11 @@ requireAdminForView: "You must log in with an administrator account to view this
 isSystemAccount: "An account created and automatically operated by the system."
 typeToConfirm: "Please enter {x} to confirm"
 deleteAccount: "Delete account"
+approveAccount: "Approve account"
+denyAccount: "Reject and delete account"
+approved: "Approved"
+notApproved: "Not approved"
+approvalStatus: "Approval status"
 document: "Documentation"
 numberOfPageCache: "Number of cached pages"
 numberOfPageCacheDescription: "Increasing this number will improve convenience for but cause more load as more memory usage on the user's device."
@@ -1063,6 +1074,10 @@ disableFederationConfirm: "Really disable federation?"
 disableFederationConfirmWarn: "Even if defederated, posts will continue to be public unless set otherwise. You usually do not need to do this."
 disableFederationOk: "Disable"
 invitationRequiredToRegister: "This instance is invite-only. You must enter a valid invite code sign up."
+approvalRequiredToRegister: "New sign-ups require manual approval. Please provide the reason why you want to create your account here."
+registerReason: "Reason for your registeration"
+registerHasNotBeenApprovedYet: "Your account is still waiting for approval. Please try again later. We will let you know once your account is approved via email."
+registerApprovalEmailRecommended: "Setting email address required is highly recommended so that users will be notified via email when their accounts are approved."
 emailNotSupported: "This instance does not support sending emails"
 postToTheChannel: "Post to channel"
 cannotBeChangedLater: "This cannot be changed later."
@@ -1839,6 +1854,8 @@ _signup:
   almostThere: "Almost there"
   emailAddressInfo: "Please enter your email address. It will not be made public."
   emailSent: "A confirmation email has been sent to your email address ({email}). Please click the included link to complete account creation."
+  approvalPending: "Your account has been created and it is currently waiting for approval."
+  reasonInfo: "Please provide the reason for your registeration."
 _accountDelete:
   accountDelete: "Delete account"
   mayTakeTime: "As account deletion is a resource-heavy process, it may take some time to complete depending on how much content you have created and how many files you have uploaded."
@@ -2542,6 +2559,7 @@ _moderationLogTypes:
   updateRole: "Role updated"
   assignRole: "Assigned to role"
   unassignRole: "Removed from role"
+  approve: "Approve"
   suspend: "Suspended"
   unsuspend: "Unsuspended"
   addCustomEmoji: "Custom emoji added"
diff --git a/locales/ko-KR.yml b/locales/ko-KR.yml
index 101a3a68a977..0c64940b7961 100644
--- a/locales/ko-KR.yml
+++ b/locales/ko-KR.yml
@@ -37,6 +37,7 @@ signup: "회원 가입"
 uploading: "업로드 중"
 save: "저장"
 users: "유저"
+approvals: "승인"
 addUser: "유저 추가"
 favorite: "즐겨찾기"
 favorites: "즐겨찾기"
@@ -152,6 +153,8 @@ unsuspend: "정지 해제"
 blockConfirm: "이 계정을 차단하시겠습니까?"
 unblockConfirm: "이 계정의 차단을 해제하시겠습니까?"
 suspendConfirm: "이 계정을 정지하시겠습니까?"
+registerApproveConfirm: "이 계정 등록을 승인합니까?"
+registerApproveConfirmDescription: "승인 후 되돌릴 수 없습니다. 승인되었다는 안내를 담은 이메일이 사용자에게 발송됩니다."
 unsuspendConfirm: "이 계정의 정지를 해제하시겠습니까?"
 selectList: "리스트 선택"
 editList: "리스트 편집"
@@ -909,6 +912,8 @@ itsOff: "꺼져 있습니다"
 on: "켜짐"
 off: "꺼짐"
 emailRequiredForSignup: "가입할 때 이메일 주소 입력을 필수로 하기"
+approvalRequiredForSignup: "계정 등록을 승인제로 하기"
+signupPendingApprovals: "계정 승인"
 unread: "읽지 않음"
 filter: "필터"
 controlPanel: "제어판"
@@ -963,6 +968,7 @@ recentNHours: "최근 {n}시간"
 recentNDays: "최근 {n}일"
 noEmailServerWarning: "메일 서버가 설정되어 있지 않습니다."
 thereIsUnresolvedAbuseReportWarning: "해결되지 않은 신고가 있습니다."
+pendingUserApprovals: "승인을 기다리는 계정이 있습니다."
 recommended: "추천"
 check: "체크"
 driveCapOverrideLabel: "이 유저의 드라이브 용량을 변경"
@@ -971,6 +977,11 @@ requireAdminForView: "열람하려면 관리자 계정으로 로그인해야 합
 isSystemAccount: "시스템에 의해 자동으로 생성되어 관리되는 계정입니다."
 typeToConfirm: "계속하시려면 {x} 을 입력하세요"
 deleteAccount: "계정 삭제"
+approveAccount: "승인하기"
+denyAccount: "거절하고 계정 삭제"
+approved: "승인됨"
+notApproved: "미승인"
+approvalStatus: "승인 현황"
 document: "문서"
 numberOfPageCache: "페이지 캐시 수"
 numberOfPageCacheDescription: "숫자가 클 수록 편리성이 높아지지만, 시스템 자원과 메모리를 더 많이 사용합니다."
@@ -1063,6 +1074,10 @@ disableFederationConfirm: "정말로 연합을 끄시겠습니까?"
 disableFederationConfirmWarn: "연합을 끄더라도 게시물이 비공개로 전환되는 것은 아닙니다. 대부분의 경우 연합을 비활성화할 필요가 없습니다."
 disableFederationOk: "연합을 끄기"
 invitationRequiredToRegister: "현재 이 서버는 비공개입니다. 회원가입을 하시려면 초대 코드가 필요합니다."
+approvalRequiredToRegister: "이 서버의 계정 등록은 승인제입니다. 가입하고자 하는 사유를 기재하면 관리자가 검토합니다."
+registerReason: "가입 사유"
+registerHasNotBeenApprovedYet: "계정이 아직 승인되지 않았습니다. 잠시 후에 다시 시도해주세요. 등록 시 이메일 주소를 기입하셨다면, 등록이 승인될 때 메일로 알려드리겠습니다."
+registerApprovalEmailRecommended: "계정 등록의 승인시 이메일을 통해 통지하지 때문에, 계정 등록시 이메일을 기입을 필수로 할 것을 권장합니다."
 emailNotSupported: "이 서버에서는 메일 전송을 지원하지 않습니다"
 postToTheChannel: "채널에 게시하기"
 cannotBeChangedLater: "나중에 변경할 수 없습니다."
@@ -1842,6 +1857,8 @@ _signup:
   almostThere: "거의 다 끝났습니다"
   emailAddressInfo: "당신이 사용하고 있는 이메일 주소를 입력해 주세요. 이메일 주소는 다른 유저에게 공개되지 않습니다."
   emailSent: "입력하신 메일 주소({email})로 확인 메일을 보내드렸습니다. 가입을 완료하시려면 보내드린 메일에 있는 링크로 접속해 주세요."
+  approvalPending: "계정은 생성되었고 승인을 대기하고 있습니다."
+  reasonInfo: "가입하고 싶은 사유를 입력하세요."
 _accountDelete:
   accountDelete: "계정 삭제"
   mayTakeTime: "계정 삭제는 서버에 부하를 가하기 때문에, 작성한 콘텐츠나 업로드한 파일의 수가 많으면 완료까지 시간이 걸릴 수 있습니다."
@@ -2545,6 +2562,7 @@ _moderationLogTypes:
   updateRole: "역할 수정"
   assignRole: "역할 할당"
   unassignRole: "역할 해제"
+  approve: "승인"
   suspend: "정지"
   unsuspend: "정지 해제"
   addCustomEmoji: "커스텀 이모지 추가"
diff --git a/packages/backend/src/config.ts b/packages/backend/src/config.ts
index d40b3c9b75b3..c722354b2658 100644
--- a/packages/backend/src/config.ts
+++ b/packages/backend/src/config.ts
@@ -99,8 +99,6 @@ type Source = {
 	perUserNotificationsMaxCount?: number;
 	deactivateAntennaThreshold?: number;
 	pidFile: string;
-
-	approvalRequiredForSignup: boolean;
 };
 
 export type Config = {
@@ -192,8 +190,6 @@ export type Config = {
 	perUserNotificationsMaxCount: number;
 	deactivateAntennaThreshold: number;
 	pidFile: string;
-
-	approvalRequiredForSignup: boolean;
 };
 
 const _filename = fileURLToPath(import.meta.url);
@@ -306,7 +302,6 @@ export function loadConfig(): Config {
 		deactivateAntennaThreshold: config.deactivateAntennaThreshold ?? (1000 * 60 * 60 * 24 * 7),
 		pidFile: config.pidFile,
 		skebStatus: undefined,
-		approvalRequiredForSignup: config.approvalRequiredForSignup,
 	};
 }
 
diff --git a/packages/backend/src/core/entities/MetaEntityService.ts b/packages/backend/src/core/entities/MetaEntityService.ts
index 3fba0295ab5b..9a58a7c47902 100644
--- a/packages/backend/src/core/entities/MetaEntityService.ts
+++ b/packages/backend/src/core/entities/MetaEntityService.ts
@@ -131,7 +131,7 @@ export class MetaEntityService {
 			noteSearchableScope: (this.config.meilisearch == null || this.config.meilisearch.scope !== 'local') ? 'global' : 'local',
 			maxFileSize: this.config.maxFileSize,
 
-			approvalRequiredForSignup: this.config.approvalRequiredForSignup,
+			approvalRequiredForSignup: instance.approvalRequiredForSignup,
 		};
 
 		return packed;
diff --git a/packages/backend/src/server/api/endpoints/admin/show-users.ts b/packages/backend/src/server/api/endpoints/admin/show-users.ts
index 4f5a3b713347..5ff29d31c02c 100644
--- a/packages/backend/src/server/api/endpoints/admin/show-users.ts
+++ b/packages/backend/src/server/api/endpoints/admin/show-users.ts
@@ -35,7 +35,7 @@ export const paramDef = {
 		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
 		offset: { type: 'integer', default: 0 },
 		sort: { type: 'string', enum: ['+follower', '-follower', '+createdAt', '-createdAt', '+updatedAt', '-updatedAt', '+lastActiveDate', '-lastActiveDate'] },
-		state: { type: 'string', enum: ['all', 'alive', 'available', 'admin', 'moderator', 'adminOrModerator', 'suspended', 'approved'], default: 'all' },
+		state: { type: 'string', enum: ['all', 'alive', 'available', 'admin', 'moderator', 'adminOrModerator', 'suspended', 'approved', 'waitingForApproval'], default: 'all' },
 		origin: { type: 'string', enum: ['combined', 'local', 'remote'], default: 'combined' },
 		username: { type: 'string', nullable: true, default: null },
 		hostname: {
@@ -65,6 +65,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				case 'alive': query.where('user.updatedAt > :date', { date: new Date(Date.now() - 1000 * 60 * 60 * 24 * 5) }); break;
 				case 'suspended': query.where('user.isSuspended = TRUE'); break;
 				case 'approved': query.where('user.approved = TRUE'); break;
+				case 'waitingForApproval': query.where('user.approved = FALSE'); break;
 				case 'admin': {
 					const adminIds = await this.roleService.getAdministratorIds();
 					if (adminIds.length === 0) return [];
diff --git a/packages/frontend/src/components/MkSignupDialog.form.vue b/packages/frontend/src/components/MkSignupDialog.form.vue
index 1caf234632f3..63925beb465f 100644
--- a/packages/frontend/src/components/MkSignupDialog.form.vue
+++ b/packages/frontend/src/components/MkSignupDialog.form.vue
@@ -270,6 +270,7 @@ async function onSubmit(): Promise<void> {
 		'g-recaptcha-response': reCaptchaResponse.value,
 		'turnstile-response': turnstileResponse.value,
 		'testcaptcha-response': testcaptchaResponse.value,
+		reason: reason.value,
 	};
 
 	const res = await fetch(`${config.apiUrl}/signup`, {
diff --git a/packages/frontend/src/components/MkVisitorDashboard.vue b/packages/frontend/src/components/MkVisitorDashboard.vue
index 9a53dbc5424b..f5edfaedaf3d 100644
--- a/packages/frontend/src/components/MkVisitorDashboard.vue
+++ b/packages/frontend/src/components/MkVisitorDashboard.vue
@@ -25,7 +25,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<MkInfo warn>{{ i18n.ts.approvalRequiredToRegister }}</MkInfo>
 			</div>
 			<div class="_gaps_s" :class="$style.mainActions">
-				<MkButton :class="$style.mainAction" full rounded data-cy-signup style="margin-right: 12px; display: none;" @click="signup()">{{ i18n.ts.joinThisServer }}</MkButton>
+			  <div v-if="instance.approvalRequiredForSignup">
+				  <MkButton :class="$style.mainAction" full rounded gradate data-cy-signup style="margin-right: 12px;" @click="signup()">{{ i18n.ts.joinThisServer }}</MkButton>
+				</div>
 				<MkButton :class="$style.mainAction" full rounded link to="https://misskey-hub.net/servers/">{{ i18n.ts.exploreOtherServers }}</MkButton>
 				<MkButton :class="$style.mainAction" full rounded gradate data-cy-signin @click="signin()">{{ i18n.ts.login }}</MkButton>
 			</div>
diff --git a/packages/frontend/src/pages/admin/approvals.vue b/packages/frontend/src/pages/admin/approvals.vue
index e0bf7ad0d52a..cb76bf37097d 100644
--- a/packages/frontend/src/pages/admin/approvals.vue
+++ b/packages/frontend/src/pages/admin/approvals.vue
@@ -37,7 +37,7 @@ const pagination = {
 	limit: 10,
 	params: computed(() => ({
 		sort: '+createdAt',
-		state: 'approved',
+		state: 'waitingForApproval',
 		origin: 'local',
 	})),
 	offsetMode: true,
diff --git a/packages/frontend/src/pages/admin/index.vue b/packages/frontend/src/pages/admin/index.vue
index 97c238992f27..e8f898af6068 100644
--- a/packages/frontend/src/pages/admin/index.vue
+++ b/packages/frontend/src/pages/admin/index.vue
@@ -78,7 +78,7 @@ misskeyApi('admin/abuse-user-reports', {
 });
 
 misskeyApi('admin/show-users', {
-	state: 'approved',
+	state: 'waitingForApproval',
 	origin: 'local',
 	limit: 1,
 }).then(approvals => {
diff --git a/packages/frontend/src/pages/admin/moderation.vue b/packages/frontend/src/pages/admin/moderation.vue
index 5eaae7c7f68e..e2e5973eecc6 100644
--- a/packages/frontend/src/pages/admin/moderation.vue
+++ b/packages/frontend/src/pages/admin/moderation.vue
@@ -22,7 +22,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 						<template #label>{{ i18n.ts.emailRequiredForSignup }}</template>
 					</MkSwitch>
 
-					<MkSwitch v-model="approvalRequiredForSignup">
+					<MkSwitch v-model="approvalRequiredForSignup" @change="onChange_approvalRequiredForSignup">
 						<template #label>{{ i18n.ts.approvalRequiredForSignup }}</template>
 						<template #caption>{{ i18n.ts.registerApprovalEmailRecommended }}</template>
 					</MkSwitch>
@@ -200,6 +200,14 @@ function onChange_emailRequiredForSignup(value: boolean) {
 	});
 }
 
+function onChange_approvalRequiredForSignup(value: boolean) {
+	os.apiWithDialog('admin/update-meta', {
+	  approvalRequiredForSignup: value,
+	}).then(() => {
+		fetchInstance(true);
+	});
+}
+
 function save_preservedUsernames() {
 	os.apiWithDialog('admin/update-meta', {
 		disableRegistration: !enableRegistration.value,
diff --git a/packages/misskey-js/src/entities.ts b/packages/misskey-js/src/entities.ts
index f0ff169fd480..3320a3edf8ec 100644
--- a/packages/misskey-js/src/entities.ts
+++ b/packages/misskey-js/src/entities.ts
@@ -261,6 +261,7 @@ export type SignupRequest = {
 	'g-recaptcha-response'?: string | null;
 	'turnstile-response'?: string | null;
 	'm-captcha-response'?: string | null;
+	reason?: string | null;
 }
 
 export type SignupResponse = MeDetailed & {