diff --git a/app/gateway-api/src/context.ts b/app/gateway-api/src/context.ts
index a1e7bb2..df199ed 100644
--- a/app/gateway-api/src/context.ts
+++ b/app/gateway-api/src/context.ts
@@ -5,6 +5,7 @@ import type { KakaoOAuthClient } from './auth/kakaoClient.js';
 import type { OAuthSessionStore } from './auth/oauthSessionStore.js';
 import type { GatewayProfileRepository } from './orchestrator/profileRepository.js';
 import type { GatewayOrchestratorHandle } from './orchestrator/gatewayOrchestrator.js';
+import type { GatewayProfileStatusService } from './lobby/profileStatusService.js';
 
 export interface GatewayApiContext {
     users: UserRepository;
@@ -17,6 +18,7 @@ export interface GatewayApiContext {
     publicBaseUrl: string;
     profiles: GatewayProfileRepository;
     orchestrator: GatewayOrchestratorHandle;
+    profileStatus: GatewayProfileStatusService;
     adminToken?: string;
     requestHeaders: Record<string, string | string[] | undefined>;
 }
@@ -32,6 +34,7 @@ export const createGatewayApiContext = (options: {
     publicBaseUrl: string;
     profiles: GatewayProfileRepository;
     orchestrator: GatewayOrchestratorHandle;
+    profileStatus: GatewayProfileStatusService;
     adminToken?: string;
     requestHeaders?: Record<string, string | string[] | undefined>;
 }): GatewayApiContext => ({
@@ -45,6 +48,7 @@ export const createGatewayApiContext = (options: {
     publicBaseUrl: options.publicBaseUrl,
     profiles: options.profiles,
     orchestrator: options.orchestrator,
+    profileStatus: options.profileStatus,
     adminToken: options.adminToken,
     requestHeaders: options.requestHeaders ?? {},
 });
diff --git a/app/gateway-api/src/lobby/profileStatusService.ts b/app/gateway-api/src/lobby/profileStatusService.ts
new file mode 100644
index 0000000..8eddf38
--- /dev/null
+++ b/app/gateway-api/src/lobby/profileStatusService.ts
@@ -0,0 +1,97 @@
+import type { GatewayOrchestratorHandle } from '../orchestrator/gatewayOrchestrator.js';
+import type {
+    GatewayProfileRecord,
+    GatewayProfileRepository,
+    GatewayProfileStatus,
+} from '../orchestrator/profileRepository.js';
+
+export type LobbyMapSnapshot = {
+    updatedAt: string | null;
+    summary?: string | null;
+};
+
+export type LobbyGeneralStatus = {
+    exists: boolean;
+    cityId: number | null;
+    cityName: string | null;
+    updatedAt: string | null;
+};
+
+export type LobbyProfileStatus = {
+    profileName: string;
+    profile: string;
+    scenario: string;
+    status: GatewayProfileStatus;
+    runtime: {
+        apiRunning: boolean;
+        daemonRunning: boolean;
+    };
+    map: LobbyMapSnapshot;
+    myGeneral: LobbyGeneralStatus;
+};
+
+export interface GatewayProfileStatusService {
+    listLobbyProfiles(input: { userId?: string } | undefined): Promise<LobbyProfileStatus[]>;
+}
+
+// 로비에서 사용할 프로필 상태를 메모리에서 반환하는 구현체.
+export class InMemoryProfileStatusService implements GatewayProfileStatusService {
+    private profiles: LobbyProfileStatus[];
+
+    constructor(initial: LobbyProfileStatus[] = []) {
+        this.profiles = [...initial];
+    }
+
+    async listLobbyProfiles(): Promise<LobbyProfileStatus[]> {
+        return this.profiles;
+    }
+
+    setProfiles(profiles: LobbyProfileStatus[]): void {
+        this.profiles = [...profiles];
+    }
+}
+
+// 프로필 저장소/오케스트레이터를 이용해 로비 상태를 구성하는 기본 구현체.
+export class RepositoryProfileStatusService implements GatewayProfileStatusService {
+    constructor(
+        private readonly profiles: GatewayProfileRepository,
+        private readonly orchestrator: GatewayOrchestratorHandle
+    ) {}
+
+    async listLobbyProfiles(): Promise<LobbyProfileStatus[]> {
+        const rows = await this.profiles.listProfiles();
+        const runtimeStates = await this.orchestrator.listRuntimeStates(
+            rows.map((profile) => profile.profileName)
+        );
+        const runtimeMap = new Map(
+            runtimeStates.map((state) => [state.profileName, state])
+        );
+        return rows.map((row) => this.mapProfile(row, runtimeMap));
+    }
+
+    private mapProfile(
+        row: GatewayProfileRecord,
+        runtimeMap: Map<string, { apiRunning: boolean; daemonRunning: boolean }>
+    ): LobbyProfileStatus {
+        return {
+            profileName: row.profileName,
+            profile: row.profile,
+            scenario: row.scenario,
+            status: row.status,
+            runtime: runtimeMap.get(row.profileName) ?? {
+                apiRunning: false,
+                daemonRunning: false,
+            },
+            map: {
+                updatedAt: null,
+                summary: null,
+            },
+            myGeneral: {
+                exists: false,
+                cityId: null,
+                cityName: null,
+                updatedAt: null,
+            },
+        };
+    }
+}
diff --git a/app/gateway-api/src/router.ts b/app/gateway-api/src/router.ts
index 40bfb30..91f3178 100644
--- a/app/gateway-api/src/router.ts
+++ b/app/gateway-api/src/router.ts
@@ -28,6 +28,23 @@ export const appRouter = router({
             now: new Date().toISOString(),
         })),
     }),
+    lobby: router({
+        profiles: procedure
+            .input(
+                z.object({
+                    sessionToken: z.string().min(1).optional(),
+                }).optional()
+            )
+            .query(async ({ ctx, input }) => {
+                const sessionToken = input?.sessionToken;
+                const session = sessionToken
+                    ? await ctx.sessions.getSession(sessionToken)
+                    : null;
+                return ctx.profileStatus.listLobbyProfiles({
+                    userId: session?.userId,
+                });
+            }),
+    }),
     admin: adminRouter,
     auth: router({
         kakaoStart: procedure
diff --git a/app/gateway-api/src/server.ts b/app/gateway-api/src/server.ts
index 0634a44..29c0dae 100644
--- a/app/gateway-api/src/server.ts
+++ b/app/gateway-api/src/server.ts
@@ -18,6 +18,7 @@ import { createPostgresUserRepository } from './auth/postgresUserRepository.js';
 import { RedisGatewaySessionService } from './auth/redisSessionService.js';
 import { createGatewayOrchestrator } from './orchestrator/orchestratorFactory.js';
 import { appRouter } from './router.js';
+import { RepositoryProfileStatusService } from './lobby/profileStatusService.js';
 
 export const createGatewayApiServer = async () => {
     const config = resolveGatewayApiConfigFromEnv();
@@ -51,6 +52,7 @@ export const createGatewayApiServer = async () => {
         config,
         process.env
     );
+    const profileStatus = new RepositoryProfileStatusService(profiles, orchestrator);
 
     const app = fastify({
         logger: true,
@@ -77,6 +79,7 @@ export const createGatewayApiServer = async () => {
                     publicBaseUrl: config.publicBaseUrl,
                     profiles,
                     orchestrator,
+                    profileStatus,
                     adminToken: config.adminToken,
                     requestHeaders: req.headers,
                 }),
diff --git a/app/gateway-api/test/authFlow.test.ts b/app/gateway-api/test/authFlow.test.ts
index 8349aaa..a8958cc 100644
--- a/app/gateway-api/test/authFlow.test.ts
+++ b/app/gateway-api/test/authFlow.test.ts
@@ -4,6 +4,7 @@ import { InMemoryGatewaySessionService } from '../src/auth/inMemorySessionServic
 import { createInMemoryUserRepository } from '../src/auth/inMemoryUserRepository.js';
 import { InMemoryOAuthSessionStore } from '../src/auth/oauthSessionStore.js';
 import { createGatewayApiContext } from '../src/context.js';
+import { InMemoryProfileStatusService } from '../src/lobby/profileStatusService.js';
 import { appRouter } from '../src/router.js';
 
 const buildCaller = () => {
@@ -62,6 +63,7 @@ const buildCaller = () => {
         }),
         listRuntimeStates: async () => [],
     };
+    const profileStatus = new InMemoryProfileStatusService();
     const caller = appRouter.createCaller(
         createGatewayApiContext({
             users,
@@ -74,6 +76,7 @@ const buildCaller = () => {
             publicBaseUrl: 'http://localhost',
             profiles,
             orchestrator,
+            profileStatus,
             requestHeaders: {},
         })
     );