diff --git a/.env b/.env
index 44bfe31..e15064c 100644
--- a/.env
+++ b/.env
@@ -20,7 +20,7 @@ OPENAI_API_KEY=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
 SYNOLOGY_SERVER_URL=https://sso.osolit.net
 SYNOLOGY_CLIENT_ID=dd477ab92304fa1cb1a2e1c6b96a6331
 SYNOLOGY_CLIENT_SECRET=
-SYNOLOGY_REDIRECT_URI=http://127.0.0.1/api/auth/synology/callback
+SYNOLOGY_REDIRECT_URI=http://127.0.0.1/auth/synology/callback
 
 # EMAIL (SMTP)
 SMTP_HOST=smtp.gmail.com
diff --git a/.env.prod b/.env.prod
index 33aeca6..32f16d5 100644
--- a/.env.prod
+++ b/.env.prod
@@ -20,7 +20,7 @@ OPENAI_API_KEY=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
 SYNOLOGY_SERVER_URL=https://sso.osolit.net
 SYNOLOGY_CLIENT_ID=afa90b7b4a9773af41f2c7b110f92d6e
 SYNOLOGY_CLIENT_SECRET=
-SYNOLOGY_REDIRECT_URI=https://weeklyreport.turbosoft.kr/api/auth/synology/callback
+SYNOLOGY_REDIRECT_URI=https://weeklyreport.turbosoft.kr/auth/synology/callback
 
 # EMAIL (SMTP)
 SMTP_HOST=smtp.gmail.com
diff --git a/frontend/auth/synology/callback.vue b/frontend/auth/synology/callback.vue
new file mode 100644
index 0000000..5c3c659
--- /dev/null
+++ b/frontend/auth/synology/callback.vue
@@ -0,0 +1,44 @@
+<template>
+  <div class="d-flex justify-content-center align-items-center min-vh-100">
+    <div class="text-center">
+      <div class="spinner-border text-primary mb-3" role="status"></div>
+      <p class="text-muted">Synology 로그인 처리 중...</p>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+definePageMeta({ layout: false })
+
+const router = useRouter()
+
+onMounted(async () => {
+  // hash fragment에서 access_token 추출
+  const hash = window.location.hash.substring(1)
+  const params = new URLSearchParams(hash)
+  const accessToken = params.get('access_token')
+  const state = params.get('state')
+  const error = params.get('error')
+  
+  if (error) {
+    router.push(`/login?error=${encodeURIComponent('Synology 인증이 취소되었습니다.')}`)
+    return
+  }
+  
+  if (!accessToken) {
+    router.push(`/login?error=${encodeURIComponent('인증 토큰이 없습니다.')}`)
+    return
+  }
+  
+  try {
+    // 서버로 access_token 전송하여 로그인 처리
+    await $fetch('/api/auth/synology/verify', {
+      method: 'POST',
+      body: { accessToken, state }
+    })
+    router.push('/')
+  } catch (e: any) {
+    router.push(`/login?error=${encodeURIComponent(e.data?.message || 'Synology 로그인에 실패했습니다.')}`)
+  }
+})
+</script>
diff --git a/nuxt.config.ts b/nuxt.config.ts
index 13e9c21..967a4fd 100644
--- a/nuxt.config.ts
+++ b/nuxt.config.ts
@@ -65,7 +65,7 @@ export default defineNuxtConfig({
     synologyServerUrl: process.env.SYNOLOGY_SERVER_URL || 'https://sso.osolit.net',
     synologyClientId: process.env.SYNOLOGY_CLIENT_ID || 'afa90b7b4a9773af41f2c7b110f92d6e',
     synologyClientSecret: process.env.SYNOLOGY_CLIENT_SECRET || '',
-    synologyRedirectUri: process.env.SYNOLOGY_REDIRECT_URI || 'https://weeklyreport.turbosoft.kr/api/auth/synology/callback',
+    synologyRedirectUri: process.env.SYNOLOGY_REDIRECT_URI || 'https://weeklyreport.turbosoft.kr/auth/synology/callback',
     public: {
       appName: '주간업무보고'
     }
diff --git a/server/api/auth/synology/index.get.ts b/server/api/auth/synology/index.get.ts
index cbda5bc..aeb3d65 100644
--- a/server/api/auth/synology/index.get.ts
+++ b/server/api/auth/synology/index.get.ts
@@ -16,7 +16,7 @@ export default defineEventHandler(async (event) => {
   
   // Synology SSO Server OAuth 인증 URL
   const authUrl = new URL(`${config.synologyServerUrl}/webman/sso/SSOOauth.cgi`)
-  authUrl.searchParams.set('response_type', 'code')
+  authUrl.searchParams.set('response_type', 'token')
   authUrl.searchParams.set('app_id', config.synologyClientId)
   authUrl.searchParams.set('redirect_uri', config.synologyRedirectUri)
   authUrl.searchParams.set('scope', 'user_id')
diff --git a/server/api/auth/synology/verify.post.ts b/server/api/auth/synology/verify.post.ts
new file mode 100644
index 0000000..1513d9a
--- /dev/null
+++ b/server/api/auth/synology/verify.post.ts
@@ -0,0 +1,90 @@
+/**
+ * Synology SSO Access Token 검증 및 로그인 처리
+ * POST /api/auth/synology/verify
+ */
+import { sql } from '~/server/utils/db'
+
+export default defineEventHandler(async (event) => {
+  const body = await readBody(event)
+  const { accessToken } = body
+  
+  if (!accessToken) {
+    throw createError({
+      statusCode: 400,
+      message: 'Access token이 없습니다.'
+    })
+  }
+  
+  const config = useRuntimeConfig()
+  
+  try {
+    // Synology SSO Server에서 사용자 정보 조회
+    const userInfoUrl = `${config.synologyServerUrl}/webman/sso/SSOAccessToken.cgi?action=exchange&access_token=${accessToken}&app_id=${config.synologyClientId}`
+    
+    const userInfoResponse = await $fetch<any>(userInfoUrl)
+    
+    if (!userInfoResponse.success) {
+      throw createError({
+        statusCode: 401,
+        message: userInfoResponse.error?.msg || 'Synology 토큰 검증에 실패했습니다.'
+      })
+    }
+    
+    const synologyUsername = userInfoResponse.data?.user_name || userInfoResponse.data?.user_id
+    
+    if (!synologyUsername) {
+      throw createError({
+        statusCode: 401,
+        message: 'Synology 사용자 정보를 가져올 수 없습니다.'
+      })
+    }
+    
+    // DB에서 synology_username으로 사용자 조회
+    const users = await sql`
+      SELECT employee_id, employee_name, employee_email, employee_role, company_id
+      FROM employees
+      WHERE synology_username = ${synologyUsername}
+        AND employee_status = 'active'
+      LIMIT 1
+    `
+    
+    if (users.length === 0) {
+      throw createError({
+        statusCode: 404,
+        message: `Synology 계정 "${synologyUsername}"과 연결된 사용자를 찾을 수 없습니다. 관리자에게 문의하세요.`
+      })
+    }
+    
+    const user = users[0]
+    
+    // 세션 생성
+    const session = await useAuthSession(event)
+    await session.update({
+      userId: user.employee_id,
+      userName: user.employee_name,
+      userEmail: user.employee_email,
+      userRole: user.employee_role,
+      companyId: user.company_id,
+      loginType: 'synology'
+    })
+    
+    return {
+      success: true,
+      user: {
+        id: user.employee_id,
+        name: user.employee_name,
+        email: user.employee_email,
+        role: user.employee_role
+      }
+    }
+  } catch (error: any) {
+    if (error.statusCode) {
+      throw error
+    }
+    console.error('Synology SSO verify error:', error)
+    throw createError({
+      statusCode: 500,
+      message: 'Synology 로그인 처리 중 오류가 발생했습니다.'
+    })
+  }
+})