diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index cedfe7b1b2..2fd44588c0 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -349,6 +349,10 @@ recaptcha: "reCAPTCHA"
 enableRecaptcha: "reCAPTCHAを有効にする"
 recaptchaSiteKey: "サイトキー"
 recaptchaSecretKey: "シークレットキー"
+turnstile: "Turnstile"
+enableTurnstile: "Turnstileを有効にする"
+turnstileSiteKey: "サイトキー"
+turnstileSecretKey: "シークレットキー"
 avoidMultiCaptchaConfirm: "複数のCaptchaを使用すると干渉を起こす可能性があります。他のCaptchaを無効にしますか？キャンセルして複数のCaptchaを有効化したままにすることも可能です。"
 antennas: "アンテナ"
 manageAntennas: "アンテナの管理"
diff --git a/packages/backend/migration/1664694635394-turnstile.js b/packages/backend/migration/1664694635394-turnstile.js
new file mode 100644
index 0000000000..4a33443950
--- /dev/null
+++ b/packages/backend/migration/1664694635394-turnstile.js
@@ -0,0 +1,15 @@
+export class turnstile1664694635394 {
+    name = 'turnstile1664694635394'
+
+    async up(queryRunner) {
+        await queryRunner.query(`ALTER TABLE "meta" ADD "enableTurnstile" boolean NOT NULL DEFAULT false`);
+        await queryRunner.query(`ALTER TABLE "meta" ADD "turnstileSiteKey" character varying(64)`);
+        await queryRunner.query(`ALTER TABLE "meta" ADD "turnstileSecretKey" character varying(64)`);
+    }
+
+    async down(queryRunner) {
+        await queryRunner.query(`ALTER TABLE "meta" DROP COLUMN "turnstileSecretKey"`);
+        await queryRunner.query(`ALTER TABLE "meta" DROP COLUMN "turnstileSiteKey"`);
+        await queryRunner.query(`ALTER TABLE "meta" DROP COLUMN "enableTurnstile"`);
+    }
+}
diff --git a/packages/backend/src/core/CaptchaService.ts b/packages/backend/src/core/CaptchaService.ts
index 67b4b90061..acfa7d5910 100644
--- a/packages/backend/src/core/CaptchaService.ts
+++ b/packages/backend/src/core/CaptchaService.ts
@@ -66,5 +66,16 @@ export class CaptchaService {
 			throw `hcaptcha-failed: ${errorCodes}`;
 		}
 	}
+
+	public async verifyTurnstile(secret: string, response: string): Promise<void> {
+		const result = await this.getCaptchaResponse('https://challenges.cloudflare.com/turnstile/v0/siteverify', secret, response).catch(e => {
+			throw `turnstile-request-failed: ${e}`;
+		});
+
+		if (result.success !== true) {
+			const errorCodes = result['error-codes'] ? result['error-codes'].join(', ') : '';
+			throw `turnstile-failed: ${errorCodes}`;
+		}
+	}
 }
 
diff --git a/packages/backend/src/models/entities/Meta.ts b/packages/backend/src/models/entities/Meta.ts
index f528b7ac08..fb25e370d2 100644
--- a/packages/backend/src/models/entities/Meta.ts
+++ b/packages/backend/src/models/entities/Meta.ts
@@ -188,6 +188,23 @@ export class Meta {
 	})
 	public recaptchaSecretKey: string | null;
 
+	@Column('boolean', {
+		default: false,
+	})
+	public enableTurnstile: boolean;
+
+	@Column('varchar', {
+		length: 64,
+		nullable: true,
+	})
+	public turnstileSiteKey: string | null;
+
+	@Column('varchar', {
+		length: 64,
+		nullable: true,
+	})
+	public turnstileSecretKey: string | null;
+
 	@Column('enum', {
 		enum: ['none', 'all', 'local', 'remote'],
 		default: 'none',
diff --git a/packages/backend/src/server/api/SignupApiService.ts b/packages/backend/src/server/api/SignupApiService.ts
index 6552dac4bf..edb8e4e8e6 100644
--- a/packages/backend/src/server/api/SignupApiService.ts
+++ b/packages/backend/src/server/api/SignupApiService.ts
@@ -61,6 +61,12 @@ export class SignupApiService {
 					ctx.throw(400, e);
 				});
 			}
+
+			if (instance.enableTurnstile && instance.turnstileSecretKey) {
+				await this.captchaService.verifyTurnstile(instance.turnstileSecretKey, body['turnstile-response']).catch(e => {
+					ctx.throw(400, e);
+				});
+			}
 		}
 	
 		const username = body['username'];
diff --git a/packages/backend/src/server/api/endpoints/admin/meta.ts b/packages/backend/src/server/api/endpoints/admin/meta.ts
index 5b43c180d8..e5b8b6f8fe 100644
--- a/packages/backend/src/server/api/endpoints/admin/meta.ts
+++ b/packages/backend/src/server/api/endpoints/admin/meta.ts
@@ -47,6 +47,14 @@ export const meta = {
 				type: 'string',
 				optional: false, nullable: true,
 			},
+			enableTurnstile: {
+				type: 'boolean',
+				optional: false, nullable: false,
+			},
+			turnstileSiteKey: {
+				type: 'string',
+				optional: false, nullable: true,
+			},
 			swPublickey: {
 				type: 'string',
 				optional: false, nullable: true,
@@ -197,6 +205,10 @@ export const meta = {
 				type: 'string',
 				optional: true, nullable: true,
 			},
+			turnstileSecretKey: {
+				type: 'string',
+				optional: true, nullable: true,
+			}
 			sensitiveMediaDetection: {
 				type: 'string',
 				optional: true, nullable: false,
@@ -374,6 +386,8 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 				hcaptchaSiteKey: instance.hcaptchaSiteKey,
 				enableRecaptcha: instance.enableRecaptcha,
 				recaptchaSiteKey: instance.recaptchaSiteKey,
+				enableTurnstile: instance.enableTurnstile,
+				turnstileSiteKey: instance.turnstileSiteKey,
 				swPublickey: instance.swPublicKey,
 				themeColor: instance.themeColor,
 				mascotImageUrl: instance.mascotImageUrl,
@@ -400,6 +414,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 				blockedHosts: instance.blockedHosts,
 				hcaptchaSecretKey: instance.hcaptchaSecretKey,
 				recaptchaSecretKey: instance.recaptchaSecretKey,
+				turnstileSecretKey: instance.turnstileSecretKey,
 				sensitiveMediaDetection: instance.sensitiveMediaDetection,
 				sensitiveMediaDetectionSensitivity: instance.sensitiveMediaDetectionSensitivity,
 				setSensitiveFlagAutomatically: instance.setSensitiveFlagAutomatically,
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 48fae9b947..2a19b1df5f 100644
--- a/packages/backend/src/server/api/endpoints/admin/update-meta.ts
+++ b/packages/backend/src/server/api/endpoints/admin/update-meta.ts
@@ -52,6 +52,9 @@ export const paramDef = {
 		enableRecaptcha: { type: 'boolean' },
 		recaptchaSiteKey: { type: 'string', nullable: true },
 		recaptchaSecretKey: { type: 'string', nullable: true },
+		enableTurnstile: { type: 'boolean' },
+		turnstileSiteKey: { type: 'string', nullable: true },
+		turnstileSecretKey: { type: 'string', nullable: true },
 		sensitiveMediaDetection: { type: 'string', enum: ['none', 'all', 'local', 'remote'] },
 		sensitiveMediaDetectionSensitivity: { type: 'string', enum: ['medium', 'low', 'high', 'veryLow', 'veryHigh'] },
 		setSensitiveFlagAutomatically: { type: 'boolean' },
@@ -231,6 +234,18 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 				set.recaptchaSecretKey = ps.recaptchaSecretKey;
 			}
 
+			if (ps.enableTurnstile !== undefined) {
+				set.enableTurnstile = ps.enableTurnstile;
+			}
+
+			if (ps.turnstileSiteKey !== undefined) {
+				set.turnstileSiteKey = ps.turnstileSiteKey;
+			}
+
+			if (ps.turnstileSecretKey !== undefined) {
+				set.turnstileSecretKey = ps.turnstileSecretKey;
+			}
+
 			if (ps.sensitiveMediaDetection !== undefined) {
 				set.sensitiveMediaDetection = ps.sensitiveMediaDetection;
 			}
diff --git a/packages/backend/src/server/api/endpoints/meta.ts b/packages/backend/src/server/api/endpoints/meta.ts
index 5c09c33941..f2e6e6aea8 100644
--- a/packages/backend/src/server/api/endpoints/meta.ts
+++ b/packages/backend/src/server/api/endpoints/meta.ts
@@ -119,6 +119,14 @@ export const meta = {
 				type: 'string',
 				optional: false, nullable: true,
 			},
+			enableTurnstile: {
+				type: 'boolean',
+				optional: false, nullable: false,
+			},
+			turnstileSiteKey: {
+				type: 'string',
+				optional: false, nullable: true,
+			},
 			swPublickey: {
 				type: 'string',
 				optional: false, nullable: true,
@@ -372,6 +380,8 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 				hcaptchaSiteKey: instance.hcaptchaSiteKey,
 				enableRecaptcha: instance.enableRecaptcha,
 				recaptchaSiteKey: instance.recaptchaSiteKey,
+				enableTurnstile: instance.enableTurnstile,
+				turnstileSiteKey: instance.turnstileSiteKey,
 				swPublickey: instance.swPublicKey,
 				themeColor: instance.themeColor,
 				mascotImageUrl: instance.mascotImageUrl,
@@ -423,6 +433,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 					elasticsearch: this.config.elasticsearch ? true : false,
 					hcaptcha: instance.enableHcaptcha,
 					recaptcha: instance.enableRecaptcha,
+					turnstile: instance.enableTurnstile,
 					objectStorage: instance.useObjectStorage,
 					twitter: instance.enableTwitterIntegration,
 					github: instance.enableGithubIntegration,
diff --git a/packages/client/src/components/MkCaptcha.vue b/packages/client/src/components/MkCaptcha.vue
index 7360734914..b399bb8921 100644
--- a/packages/client/src/components/MkCaptcha.vue
+++ b/packages/client/src/components/MkCaptcha.vue
@@ -20,7 +20,7 @@ type Captcha = {
 	getResponse(id: string): string;
 };
 
-type CaptchaProvider = 'hcaptcha' | 'recaptcha';
+type CaptchaProvider = 'hcaptcha' | 'recaptcha' | 'turnstile';
 
 type CaptchaContainer = {
 	readonly [_ in CaptchaProvider]?: Captcha;
@@ -48,6 +48,7 @@ const variable = computed(() => {
 	switch (props.provider) {
 		case 'hcaptcha': return 'hcaptcha';
 		case 'recaptcha': return 'grecaptcha';
+		case 'turnstile': return 'turnstile';
 	}
 });
 
@@ -57,6 +58,7 @@ const src = computed(() => {
 	switch (props.provider) {
 		case 'hcaptcha': return 'https://js.hcaptcha.com/1/api.js?render=explicit&recaptchacompat=off';
 		case 'recaptcha': return 'https://www.recaptcha.net/recaptcha/api.js?render=explicit';
+		case 'turnstile': return 'https://challenges.cloudflare.com/turnstile/v0/api.js?render=explicit';
 	}
 });
 
diff --git a/packages/client/src/components/MkSignup.vue b/packages/client/src/components/MkSignup.vue
index a324bb6f5a..c1f91b18c2 100644
--- a/packages/client/src/components/MkSignup.vue
+++ b/packages/client/src/components/MkSignup.vue
@@ -59,6 +59,7 @@
 	</MkSwitch>
 	<MkCaptcha v-if="instance.enableHcaptcha" ref="hcaptcha" v-model="hCaptchaResponse" class="_formBlock captcha" provider="hcaptcha" :sitekey="instance.hcaptchaSiteKey"/>
 	<MkCaptcha v-if="instance.enableRecaptcha" ref="recaptcha" v-model="reCaptchaResponse" class="_formBlock captcha" provider="recaptcha" :sitekey="instance.recaptchaSiteKey"/>
+	<MkCaptcha v-if="instance.enableTurnstile" ref="turnstile" v-model="turnstileResponse" class="_formBlock captcha" provider="turnstile" :sitekey="instance.turnstileSiteKey"/>
 	<MkButton class="_formBlock" type="submit" :disabled="shouldDisableSubmitting" gradate data-cy-signup-submit>{{ i18n.ts.start }}</MkButton>
 </form>
 </template>
@@ -92,6 +93,7 @@ const host = toUnicode(config.host);
 
 let hcaptcha = $ref();
 let recaptcha = $ref();
+let turnstile = $ref();
 
 let username: string = $ref('');
 let password: string = $ref('');
@@ -106,12 +108,14 @@ let submitting: boolean = $ref(false);
 let ToSAgreement: boolean = $ref(false);
 let hCaptchaResponse = $ref(null);
 let reCaptchaResponse = $ref(null);
+let turnstileResponse = $ref(null);
 
 const shouldDisableSubmitting = $computed((): boolean => {
 	return submitting ||
 		instance.tosUrl && !ToSAgreement ||
 		instance.enableHcaptcha && !hCaptchaResponse ||
 		instance.enableRecaptcha && !reCaptchaResponse ||
+		instance.enableTurnstile && !turnstileResponse ||
 		passwordRetypeState === 'not-match';
 });
 
@@ -198,6 +202,7 @@ function onSubmit(): void {
 		invitationCode,
 		'hcaptcha-response': hCaptchaResponse,
 		'g-recaptcha-response': reCaptchaResponse,
+		'turnstile-response': turnstileResponse,
 	}).then(() => {
 		if (instance.emailRequiredForSignup) {
 			os.alert({
@@ -222,6 +227,7 @@ function onSubmit(): void {
 		submitting = false;
 		hcaptcha.reset?.();
 		recaptcha.reset?.();
+		turnstile.reset?.();
 
 		os.alert({
 			type: 'error',
diff --git a/packages/client/src/pages/admin/bot-protection.vue b/packages/client/src/pages/admin/bot-protection.vue
index 72d5e379de..484a9d1a1a 100644
--- a/packages/client/src/pages/admin/bot-protection.vue
+++ b/packages/client/src/pages/admin/bot-protection.vue
@@ -6,6 +6,7 @@
 				<option :value="null">{{ i18n.ts.none }} ({{ i18n.ts.notRecommended }})</option>
 				<option value="hcaptcha">hCaptcha</option>
 				<option value="recaptcha">reCAPTCHA</option>
+				<option value="turnstile">Turnstile</option>
 			</FormRadios>
 
 			<template v-if="provider === 'hcaptcha'">
@@ -36,6 +37,20 @@
 					<MkCaptcha provider="recaptcha" :sitekey="recaptchaSiteKey"/>
 				</FormSlot>
 			</template>
+			<template v-else-if="provider === 'turnstile'">
+				<FormInput v-model="turnstileSiteKey" class="_formBlock">
+					<template #prefix><i class="fas fa-key"></i></template>
+					<template #label>{{ i18n.ts.turnstileSiteKey }}</template>
+				</FormInput>
+				<FormInput v-model="turnstileSecretKey" class="_formBlock">
+					<template #prefix><i class="fas fa-key"></i></template>
+					<template #label>{{ i18n.ts.turnstileSecretKey }}</template>
+				</FormInput>
+				<FormSlot class="_formBlock">
+					<template #label>{{ i18n.ts.preview }}</template>
+					<MkCaptcha provider="turnstile" :sitekey="turnstileSiteKey || '1x00000000000000000000AA'"/>
+				</FormSlot>
+			</template>
 
 			<FormButton primary @click="save"><i class="fas fa-save"></i> {{ i18n.ts.save }}</FormButton>
 		</div>
@@ -61,6 +76,8 @@ let hcaptchaSiteKey: string | null = $ref(null);
 let hcaptchaSecretKey: string | null = $ref(null);
 let recaptchaSiteKey: string | null = $ref(null);
 let recaptchaSecretKey: string | null = $ref(null);
+let turnstileSiteKey: string | null = $ref(null);
+let turnstileSecretKey: string | null = $ref(null);
 
 async function init() {
 	const meta = await os.api('admin/meta');
@@ -68,8 +85,10 @@ async function init() {
 	hcaptchaSecretKey = meta.hcaptchaSecretKey;
 	recaptchaSiteKey = meta.recaptchaSiteKey;
 	recaptchaSecretKey = meta.recaptchaSecretKey;
+	turnstileSiteKey = meta.turnstileSiteKey;
+	turnstileSecretKey = meta.turnstileSecretKey;
 
-	provider = meta.enableHcaptcha ? 'hcaptcha' : meta.enableRecaptcha ? 'recaptcha' : null;
+	provider = meta.enableHcaptcha ? 'hcaptcha' : meta.enableRecaptcha ? 'recaptcha' : meta.enableTurnstile ? 'turnstile' : null;
 }
 
 function save() {
@@ -80,6 +99,9 @@ function save() {
 		enableRecaptcha: provider === 'recaptcha',
 		recaptchaSiteKey,
 		recaptchaSecretKey,
+		enableTurnstile: provider === 'turnstile',
+		turnstileSiteKey,
+		turnstileSecretKey,
 	}).then(() => {
 		fetchInstance();
 	});
diff --git a/packages/client/src/pages/admin/index.vue b/packages/client/src/pages/admin/index.vue
index 9200b5d547..20f82bba28 100644
--- a/packages/client/src/pages/admin/index.vue
+++ b/packages/client/src/pages/admin/index.vue
@@ -53,7 +53,7 @@ let view = $ref(null);
 let el = $ref(null);
 let pageProps = $ref({});
 let noMaintainerInformation = isEmpty(instance.maintainerName) || isEmpty(instance.maintainerEmail);
-let noBotProtection = !instance.disableRegistration && !instance.enableHcaptcha && !instance.enableRecaptcha;
+let noBotProtection = !instance.disableRegistration && !instance.enableHcaptcha && !instance.enableRecaptcha && !instance.enableTurnstile;
 let noEmailServer = !instance.enableEmail;
 let thereIsUnresolvedAbuseReport = $ref(false);
 let currentPage = $computed(() => router.currentRef.value.child);
diff --git a/packages/client/src/pages/admin/security.vue b/packages/client/src/pages/admin/security.vue
index c36cedb312..65d079c2cf 100644
--- a/packages/client/src/pages/admin/security.vue
+++ b/packages/client/src/pages/admin/security.vue
@@ -9,6 +9,7 @@
 					<template #label>{{ i18n.ts.botProtection }}</template>
 					<template v-if="enableHcaptcha" #suffix>hCaptcha</template>
 					<template v-else-if="enableRecaptcha" #suffix>reCAPTCHA</template>
+					<template v-else-if="enableTurnstile" #suffix>Turnstile</template>
 					<template v-else #suffix>{{ i18n.ts.none }} ({{ i18n.ts.notRecommended }})</template>
 
 					<XBotProtection/>
@@ -120,6 +121,7 @@ import { definePageMetadata } from '@/scripts/page-metadata';
 let summalyProxy: string = $ref('');
 let enableHcaptcha: boolean = $ref(false);
 let enableRecaptcha: boolean = $ref(false);
+let enableTurnstile: boolean = $ref(false);
 let sensitiveMediaDetection: string = $ref('none');
 let sensitiveMediaDetectionSensitivity: number = $ref(0);
 let setSensitiveFlagAutomatically: boolean = $ref(false);
@@ -132,6 +134,7 @@ async function init() {
 	summalyProxy = meta.summalyProxy;
 	enableHcaptcha = meta.enableHcaptcha;
 	enableRecaptcha = meta.enableRecaptcha;
+	enableTurnstile = meta.enableTurnstile;
 	sensitiveMediaDetection = meta.sensitiveMediaDetection;
 	sensitiveMediaDetectionSensitivity =
 		meta.sensitiveMediaDetectionSensitivity === 'veryLow' ? 0 :