diff --git a/packages/core/src/queries/custom-phrase.ts b/packages/core/src/queries/custom-phrase.ts
new file mode 100644
index 000000000..8f1c01a6d
--- /dev/null
+++ b/packages/core/src/queries/custom-phrase.ts
@@ -0,0 +1,14 @@
+import { CustomPhrase, CustomPhrases } from '@logto/schemas';
+import { sql } from 'slonik';
+
+import { convertToIdentifiers } from '@/database/utils';
+import envSet from '@/env-set';
+
+const { table, fields } = convertToIdentifiers(CustomPhrases);
+
+export const findCustomPhraseByLanguageKey = async (languageKey: string): Promise<CustomPhrase> =>
+  envSet.pool.one<CustomPhrase>(sql`
+    select ${sql.join(Object.values(fields), sql`, `)}
+    from ${table}
+    where ${fields.languageKey} = ${languageKey}
+  `);
diff --git a/packages/core/src/routes/custom-phrase.test.ts b/packages/core/src/routes/custom-phrase.test.ts
new file mode 100644
index 000000000..eb502a036
--- /dev/null
+++ b/packages/core/src/routes/custom-phrase.test.ts
@@ -0,0 +1,62 @@
+import { CustomPhrase } from '@logto/schemas';
+
+import RequestError from '@/errors/RequestError';
+import phraseRoutes from '@/routes/custom-phrase';
+import { createRequester } from '@/utils/test-utils';
+
+const mockLanguageKey = 'en-US';
+
+const mockCustomPhrases: Record<string, CustomPhrase> = {
+  [mockLanguageKey]: {
+    languageKey: mockLanguageKey,
+    translation: {
+      input: {
+        username: 'Username',
+        password: 'Password',
+        email: 'Email',
+        phone_number: 'Phone number',
+        confirm_password: 'Confirm password',
+      },
+    },
+  },
+};
+
+const findCustomPhraseByLanguageKey = jest.fn(async (languageKey: string) => {
+  const mockCustomPhrase = mockCustomPhrases[languageKey];
+
+  if (!mockCustomPhrase) {
+    throw new RequestError({ code: 'entity.not_found', status: 404 });
+  }
+
+  return mockCustomPhrase;
+});
+
+jest.mock('@/queries/custom-phrase', () => ({
+  findCustomPhraseByLanguageKey: async (key: string) => findCustomPhraseByLanguageKey(key),
+}));
+
+describe('customPhraseRoutes', () => {
+  const phraseRequest = createRequester({ authedRoutes: phraseRoutes });
+
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
+  describe('GET /custom-phrases/:languageKey', () => {
+    it('should call findCustomPhraseByLanguageKey once', async () => {
+      await phraseRequest.get(`/custom-phrases/${mockLanguageKey}`);
+      expect(findCustomPhraseByLanguageKey).toBeCalledTimes(1);
+    });
+
+    it('should return the specified custom phrase existing in the database', async () => {
+      const response = await phraseRequest.get(`/custom-phrases/${mockLanguageKey}`);
+      expect(response.status).toEqual(200);
+      expect(response.body).toEqual(mockCustomPhrases[mockLanguageKey]);
+    });
+
+    it('should return 404 status code when there is no specified custom phrase in the database', async () => {
+      const response = await phraseRequest.get('/custom-phrases/en-UK');
+      expect(response.status).toEqual(404);
+    });
+  });
+});
diff --git a/packages/core/src/routes/custom-phrase.ts b/packages/core/src/routes/custom-phrase.ts
new file mode 100644
index 000000000..41bb34e42
--- /dev/null
+++ b/packages/core/src/routes/custom-phrase.ts
@@ -0,0 +1,26 @@
+import { CustomPhrases } from '@logto/schemas';
+
+import koaGuard from '@/middleware/koa-guard';
+import { findCustomPhraseByLanguageKey } from '@/queries/custom-phrase';
+
+import { AuthedRouter } from './types';
+
+export default function phraseRoutes<T extends AuthedRouter>(router: T) {
+  router.get(
+    '/custom-phrases/:languageKey',
+    koaGuard({
+      // Next up: guard languageKey by enum LanguageKey (that will be provided by @sijie later.)
+      params: CustomPhrases.createGuard.pick({ languageKey: true }),
+      response: CustomPhrases.guard,
+    }),
+    async (ctx, next) => {
+      const {
+        params: { languageKey },
+      } = ctx.guard;
+
+      ctx.body = await findCustomPhraseByLanguageKey(languageKey);
+
+      return next();
+    }
+  );
+}
diff --git a/packages/core/src/routes/init.ts b/packages/core/src/routes/init.ts
index 997755810..1c535804f 100644
--- a/packages/core/src/routes/init.ts
+++ b/packages/core/src/routes/init.ts
@@ -10,6 +10,7 @@ import adminUserRoutes from '@/routes/admin-user';
 import applicationRoutes from '@/routes/application';
 import authnRoutes from '@/routes/authn';
 import connectorRoutes from '@/routes/connector';
+import customPhraseRoutes from '@/routes/custom-phrase';
 import dashboardRoutes from '@/routes/dashboard';
 import logRoutes from '@/routes/log';
 import resourceRoutes from '@/routes/resource';
@@ -39,6 +40,7 @@ const createRouters = (provider: Provider) => {
   logRoutes(managementRouter);
   roleRoutes(managementRouter);
   dashboardRoutes(managementRouter);
+  customPhraseRoutes(managementRouter);
 
   const anonymousRouter: AnonymousRouter = new Router();
   wellKnownRoutes(anonymousRouter, provider);
diff --git a/packages/schemas/src/foundations/jsonb-types.ts b/packages/schemas/src/foundations/jsonb-types.ts
index 78b1fdda7..de3414ac5 100644
--- a/packages/schemas/src/foundations/jsonb-types.ts
+++ b/packages/schemas/src/foundations/jsonb-types.ts
@@ -155,3 +155,15 @@ export const adminConsoleConfigGuard = z.object({
 });
 
 export type AdminConsoleConfig = z.infer<typeof adminConsoleConfigGuard>;
+
+/**
+ * Phrases
+ */
+
+export type Translation = {
+  [key: string]: string | Translation;
+};
+
+export const translationGuard: z.ZodType<Translation> = z.lazy(() =>
+  z.record(z.string().or(translationGuard))
+);
diff --git a/packages/schemas/tables/custom_phrases.sql b/packages/schemas/tables/custom_phrases.sql
new file mode 100644
index 000000000..7104721d3
--- /dev/null
+++ b/packages/schemas/tables/custom_phrases.sql
@@ -0,0 +1,5 @@
+create table custom_phrases (
+  language_key varchar(16) not null,
+  translation jsonb /* @use Translation */ not null,
+  primary key(language_key)
+);