diff --git a/packages/common/components/src/ui/page-title/index.tsx b/packages/common/components/src/ui/page-title/index.tsx
index a685ffbaa..ebe5559f2 100644
--- a/packages/common/components/src/ui/page-title/index.tsx
+++ b/packages/common/components/src/ui/page-title/index.tsx
@@ -1,6 +1,6 @@
 "use client";
 
-import React, { useState } from "react";
+import React, { useEffect, useState } from "react";
 import {
   Dialog,
   DialogContent,
@@ -9,8 +9,26 @@ import {
   DialogTrigger,
 } from "../dialog";
 import { useQuery } from "@tanstack/react-query";
-import { getMenuDetail } from "../../api";
+import { getMenuDetail, getSiteInfo } from "../../api";
 import { ENDPOINT } from "../../config";
+import { getCookie } from "../../lib";
+
+/** 공통 레이아웃 밖 페이지(대시보드·로그인·오류 등)의 문서 제목. 각 앱 layout metadata 의 title 과 동일하게 유지 */
+const PLATFORM_TITLE = "유역하수도통합플랫폼 Hasuon";
+
+const DASHBOARD_MENU_NAME = "대시보드";
+
+/** 문서 제목: "유역하수도통합플랫폼 Hasuon - 사이트명 > 메뉴1 > 메뉴2" (대시보드는 플랫폼 제목만) */
+function buildDocumentTitle(siteNm: string | undefined, title: string, menuPaths: string[]) {
+  const menus = (menuPaths.length > 0 ? menuPaths : [title]).filter(Boolean);
+  const isDashboard =
+    menus[menus.length - 1] === DASHBOARD_MENU_NAME ||
+    (typeof window !== "undefined" && /\/dashboard\/?$/.test(window.location.pathname));
+
+  if (menus.length === 0 || isDashboard) return PLATFORM_TITLE;
+
+  return `${PLATFORM_TITLE} - ${[siteNm, ...menus].filter(Boolean).join(" > ")}`;
+}
 
 const PageTitle = ({
   title,
@@ -29,6 +47,24 @@ const PageTitle = ({
     enabled: !!menuCd,
   });
 
+  // 헤더와 같은 쿼리 키를 사용해 캐시된 사이트 정보를 재사용
+  const siteId = getCookie("site-id-key") ?? "";
+  const { data: siteInfo } = useQuery({
+    queryKey: [ENDPOINT.CMS_SERVICE.SITES, siteId],
+    queryFn: () => getSiteInfo(siteId),
+    enabled: !!siteId,
+  });
+
+  const documentTitle = buildDocumentTitle(siteInfo?.siteNm, title, menuPaths);
+
+  // 메뉴 이동 시마다 문서 제목 갱신, 레이아웃을 벗어나면 플랫폼 제목으로 복원
+  useEffect(() => {
+    document.title = documentTitle;
+    return () => {
+      document.title = PLATFORM_TITLE;
+    };
+  }, [documentTitle]);
+
   return (
     <div className="flex w-full items-center justify-between px-[1.8rem] pt-[2rem]">
       <div className="flex items-center gap-3">