diff --git a/src/components/Footer.tsx b/src/components/Footer.tsx
index b6cc250..b6e3b61 100644
--- a/src/components/Footer.tsx
+++ b/src/components/Footer.tsx
@@ -49,7 +49,9 @@ export const Footer: React.FC = () => {
           <p>
             {locale === 'zh'
               ? '湘菜 · 辣度可调'
-              : 'อาหารหูหนาน (湘菜) · ปรับระดับความเผ็ดได้'}
+              : locale === 'en'
+                ? 'Hunan cuisine · Adjustable spice'
+                : 'อาหารหูหนาน (湘菜) · ปรับระดับความเผ็ดได้'}
           </p>
         </div>
       </div>
diff --git a/src/components/Header.tsx b/src/components/Header.tsx
index a186bf0..75c2790 100644
--- a/src/components/Header.tsx
+++ b/src/components/Header.tsx
@@ -56,7 +56,7 @@ export const Header: React.FC = () => {
             role="group"
             aria-label="Language"
           >
-            <button
+           <button
               type="button"
               onClick={() => setLocale('th')}
               className={
@@ -80,6 +80,18 @@ export const Header: React.FC = () => {
             >
               {t('lang.zh')}
             </button>
+            <button
+              type="button"
+              onClick={() => setLocale('en')}
+              className={
+                locale === 'en'
+                  ? 'rounded-lg bg-zinc-900 px-3 py-1.5 text-sm font-semibold text-white'
+                  : 'rounded-lg px-3 py-1.5 text-sm font-semibold text-zinc-700 hover:bg-zinc-100'
+              }
+              aria-pressed={locale === 'en'}
+            >
+              {t('lang.en')}
+            </button>
           </div>
         </div>
       </div>
@@ -96,4 +108,3 @@ export const Header: React.FC = () => {
     </header>
   )
 }
-
diff --git a/src/i18n/I18nProvider.tsx b/src/i18n/I18nProvider.tsx
index 75ed4de..cfc3d6c 100644
--- a/src/i18n/I18nProvider.tsx
+++ b/src/i18n/I18nProvider.tsx
@@ -7,7 +7,7 @@ const STORAGE_KEY = 'locale'
 export const I18nProvider: React.FC<React.PropsWithChildren> = ({ children }) => {
   const [locale, setLocaleState] = useState<Locale>(() => {
     const fromStorage = window.localStorage.getItem(STORAGE_KEY)
-    if (fromStorage === 'th' || fromStorage === 'zh') return fromStorage
+    if (fromStorage === 'th' || fromStorage === 'zh' || fromStorage === 'en') return fromStorage
     return DEFAULT_LOCALE
   })
 
@@ -28,7 +28,9 @@ export const I18nProvider: React.FC<React.PropsWithChildren> = ({ children }) =>
     document.title =
       locale === 'zh'
         ? '湘味小馆 | 正宗湘菜在泰国'
-        : 'Xiang Hunan Kitchen | อาหารหูหนานแท้ในไทย'
+        : locale === 'en'
+          ? 'Xiang Hunan Kitchen | Authentic Hunan Cuisine'
+          : 'Xiang Hunan Kitchen | อาหารหูหนานแท้ในไทย'
   }, [locale])
 
   const value = useMemo<I18nContextValue>(
@@ -42,4 +44,3 @@ export const I18nProvider: React.FC<React.PropsWithChildren> = ({ children }) =>
 
   return <I18nContext.Provider value={value}>{children}</I18nContext.Provider>
 }
-
diff --git a/src/i18n/translations.ts b/src/i18n/translations.ts
index 5a62fb0..aad0137 100644
--- a/src/i18n/translations.ts
+++ b/src/i18n/translations.ts
@@ -1,4 +1,4 @@
-export type Locale = 'th' | 'zh'
+export type Locale = 'th' | 'zh' | 'en'
 
 export const DEFAULT_LOCALE: Locale = 'th'
 
@@ -13,6 +13,7 @@ export const TRANSLATIONS: Record<Locale, Translations> = {
     'nav.news': 'ข่าวสาร',
     'lang.th': 'ไทย',
     'lang.zh': '中文',
+    'lang.en': 'EN',
 
     'home.hero.title': 'อาหารหูหนาน (湘菜) รสจัด เผ็ดหอม กลมกล่อม',
     'home.hero.desc':
@@ -87,9 +88,19 @@ export const TRANSLATIONS: Record<Locale, Translations> = {
     'common.call': 'โทร',
     'common.contact': 'ติดต่อ',
     'common.loadFailed': 'โหลดข้อมูลไม่สำเร็จ',
+    'common.loading': 'กำลังโหลด',
     'footer.contact': 'ติดต่อ',
     'footer.hours': 'เวลาเปิด-ปิด',
     'home.hoursPreview': '11:00–22:00',
+
+    'post.notFound': 'ไม่พบข้อมูลข่าวสาร',
+    'categories.title': 'หมวดหมู่',
+    'categories.subtitle': 'หน้านี้เป็นหน้ารวมหมวดหมู่จาก CMS (ยังไม่ได้ผูกเข้ากับเมนูอาหาร)',
+    'categories.view': 'ดูรายการข่าวในหมวดนี้',
+    'categories.empty': 'ยังไม่มีหมวดหมู่',
+    'categoryDetail.titleFallback': 'หมวดหมู่',
+    'categoryDetail.subtitle': 'ข่าวสารทั้งหมดในหมวดนี้',
+    'categoryDetail.empty': 'ยังไม่มีข่าวสารในหมวดนี้',
   },
   zh: {
     'nav.home': '首页',
@@ -99,6 +110,7 @@ export const TRANSLATIONS: Record<Locale, Translations> = {
     'nav.news': '新闻/活动',
     'lang.th': 'ไทย',
     'lang.zh': '中文',
+    'lang.en': 'EN',
 
     'home.hero.title': '正宗湘菜（湘菜） 香辣鲜香，层次分明',
     'home.hero.desc':
@@ -167,8 +179,116 @@ export const TRANSLATIONS: Record<Locale, Translations> = {
     'common.call': '拨打电话',
     'common.contact': '联系',
     'common.loadFailed': '加载失败',
+    'common.loading': '加载中',
     'footer.contact': '联系',
     'footer.hours': '营业时间',
     'home.hoursPreview': '11:00–22:00',
+
+    'post.notFound': '未找到该新闻内容',
+    'categories.title': '分类',
+    'categories.subtitle': '此页面展示 CMS 中的分类（尚未与菜品菜单关联）',
+    'categories.view': '查看该分类下的新闻',
+    'categories.empty': '暂无分类',
+    'categoryDetail.titleFallback': '分类',
+    'categoryDetail.subtitle': '该分类下的全部新闻',
+    'categoryDetail.empty': '该分类下暂无新闻',
+  },
+  en: {
+    'nav.home': 'Home',
+    'nav.menu': 'Menu',
+    'nav.about': 'About',
+    'nav.contact': 'Contact',
+    'nav.news': 'News',
+    'lang.th': 'TH',
+    'lang.zh': '中文',
+    'lang.en': 'EN',
+
+    'home.hero.title': 'Authentic Hunan Cuisine, Bold and Fragrant',
+    'home.hero.desc':
+      'A Hunan (Xiang) restaurant in Thailand with aromatic dry chilies and customizable heat - perfect for family meals and catch-ups with friends.',
+    'home.hero.cta.menu': 'View menu',
+    'home.hero.cta.contact': 'Reserve / Contact',
+    'home.section.latestNews': 'Latest news',
+    'home.section.latestNews.desc': 'Promotions, new dishes, and store updates',
+    'home.section.latestNews.more': 'See all',
+    'home.emptyNews': 'No news yet',
+    'home.cta.title': 'Ready for a real Xiang kick?',
+    'home.cta.desc':
+      'Call or message us on Line to reserve a table - we will help you pick the right spice level.',
+    'home.cta.call': 'Call to reserve',
+    'home.cta.map': 'See map & hours',
+
+    'home.feature.1.title': 'Signature dry-chili aroma',
+    'home.feature.1.desc': 'Stir-fried over high heat with bold spice and layered fragrance.',
+    'home.feature.2.title': 'Made for sharing',
+    'home.feature.2.desc': 'Perfect for sharing plates with friends and family.',
+    'home.feature.3.title': 'Easy reservations',
+    'home.feature.3.desc': 'Call or Line us for a table or dish recommendations.',
+
+    'menu.title': 'Menu',
+    'menu.subtitle':
+      'Bold Hunan flavors with aromatic dry chilies. Spice level can be adjusted to your taste.',
+    'menu.allergy.title': 'Allergies or dietary needs?',
+    'menu.allergy.desc':
+      'Tell our staff before ordering. We can adjust recipes and recommend suitable dishes.',
+    'menu.allergy.call': 'Call us',
+    'menu.allergy.directions': 'Directions',
+
+    'about.title': 'Our story',
+    'about.subtitle':
+      'We want more people in Thailand to experience the charm of Hunan cuisine: fragrant dry chilies, balanced heat, and friendly service.',
+    'about.occasions': 'Perfect for',
+    'about.cta.title': 'Not sure what to order?',
+    'about.cta.desc':
+      'Call or Line us. Tell us your group size and spice preference - we will suggest a set.',
+    'about.cta.call': 'Call to reserve',
+    'about.cta.contact': 'Contact & directions',
+
+    'contact.title': 'Contact & directions',
+    'contact.subtitle': 'Reservations, menu questions, or spice recommendations - reach us anytime.',
+    'contact.shopInfo': 'Store info',
+    'contact.phone': 'Phone',
+    'contact.line': 'Line',
+    'contact.address': 'Address',
+    'contact.hours': 'Hours',
+    'contact.mapTitle': 'Map',
+    'contact.takeaway.title': 'Want takeaway?',
+    'contact.takeaway.desc':
+      'Call ahead for faster pickup, or message us on Line with your pickup time.',
+    'contact.takeaway.call': 'Call to order',
+    'contact.takeaway.line': 'Message on Line',
+
+    'news.title': 'News & promotions',
+    'news.subtitle': 'Updates on promotions, events, and new dishes',
+    'news.empty': 'No news yet',
+
+    'post.back': 'Back to news',
+    'post.notFound': 'Sorry, this post is not available.',
+
+    'notFound.title': 'Page not found',
+    'notFound.desc': 'The link may be incorrect, or the page has been moved.',
+    'notFound.back': 'Back to home',
+
+    'card.more': 'Read more',
+    'card.open': 'Open',
+
+    'common.phone': 'Phone',
+    'common.hours': 'Hours',
+    'common.call': 'Call',
+    'common.contact': 'Contact',
+    'common.loadFailed': 'Failed to load.',
+    'common.loading': 'Loading',
+    'footer.contact': 'Contact',
+    'footer.hours': 'Hours',
+    'home.hoursPreview': '11:00-22:00',
+
+    'categories.title': 'Categories',
+    'categories.subtitle':
+      'This page lists categories from the CMS (not connected to the food menu yet).',
+    'categories.view': 'View posts in this category',
+    'categories.empty': 'No categories yet',
+    'categoryDetail.titleFallback': 'Category',
+    'categoryDetail.subtitle': 'All posts in this category',
+    'categoryDetail.empty': 'No posts in this category yet',
   },
 }
diff --git a/src/pages/Categories.tsx b/src/pages/Categories.tsx
index 57ffd3c..023414e 100644
--- a/src/pages/Categories.tsx
+++ b/src/pages/Categories.tsx
@@ -7,6 +7,7 @@ import { createClient } from '../clientsdk/client'
 import { customQuerySerializer } from '../clientsdk/querySerializer'
 import type { Category } from '../clientsdk/types.gen'
 import { TENANT_API_KEY, TENANT_SLUG, API_URL } from '../config'
+import { useI18n } from '../i18n/useI18n'
 
 type ListResponse<T> = { docs: T[] }
 
@@ -22,6 +23,7 @@ const client = createClient({
 })
 
 export const CategoriesPage: React.FC = () => {
+  const { t } = useI18n()
   const [categories, setCategories] = useState<Category[]>([])
   const [loading, setLoading] = useState(true)
   const [error, setError] = useState<string | null>(null)
@@ -41,7 +43,7 @@ export const CategoriesPage: React.FC = () => {
 
         setCategories(response.data?.docs ?? [])
       } catch (err) {
-        setError(err instanceof Error ? err.message : 'โหลดข้อมูลไม่สำเร็จ')
+        setError(err instanceof Error ? err.message : t('common.loadFailed'))
         console.error('Fetch categories failed:', err)
       } finally {
         setLoading(false)
@@ -49,7 +51,7 @@ export const CategoriesPage: React.FC = () => {
     }
 
     fetchCategories()
-  }, [])
+  }, [t])
 
   return (
     <div className="min-h-screen bg-zinc-50 text-zinc-900">
@@ -57,9 +59,9 @@ export const CategoriesPage: React.FC = () => {
 
       <main className="mx-auto w-full max-w-6xl px-4 py-10">
         <header className="mb-10">
-          <h1 className="text-4xl font-semibold tracking-tight">หมวดหมู่</h1>
+          <h1 className="text-4xl font-semibold tracking-tight">{t('categories.title')}</h1>
           <p className="mt-3 max-w-2xl text-zinc-600">
-            หน้านี้เป็นหน้ารวมหมวดหมู่จาก CMS (ยังไม่ได้ผูกเข้ากับเมนูอาหาร)
+            {t('categories.subtitle')}
           </p>
         </header>
 
@@ -90,13 +92,13 @@ export const CategoriesPage: React.FC = () => {
                   className="rounded-2xl border border-zinc-200 bg-white p-6 shadow-sm transition hover:shadow-md"
                 >
                   <h2 className="text-lg font-semibold">{category.title}</h2>
-                  <p className="mt-2 text-sm text-zinc-600">ดูรายการข่าวในหมวดนี้</p>
+                  <p className="mt-2 text-sm text-zinc-600">{t('categories.view')}</p>
                 </Link>
               ))}
         </div>
 
         {!loading && categories.length === 0 && !error ? (
-          <div className="py-12 text-center text-zinc-600">ยังไม่มีหมวดหมู่</div>
+          <div className="py-12 text-center text-zinc-600">{t('categories.empty')}</div>
         ) : null}
       </main>
 
diff --git a/src/pages/CategoryDetail.tsx b/src/pages/CategoryDetail.tsx
index 4d5a286..bc4ff55 100644
--- a/src/pages/CategoryDetail.tsx
+++ b/src/pages/CategoryDetail.tsx
@@ -10,6 +10,7 @@ import { customQuerySerializer } from '../clientsdk/querySerializer'
 import type { Category, Post } from '../clientsdk/types.gen'
 import { TENANT_API_KEY, TENANT_SLUG, API_URL } from '../config'
 import { isCategory } from '../utils/payload'
+import { useI18n } from '../i18n/useI18n'
 
 type ListResponse<T> = { docs: T[] }
 
@@ -34,7 +35,7 @@ const stripHtml = (html: string): string => {
 
 const formatDate = (dateString: string): string => {
   const date = new Date(dateString)
-  return date.toLocaleDateString('th-TH', {
+  return date.toLocaleDateString(undefined, {
     year: 'numeric',
     month: 'long',
     day: 'numeric',
@@ -43,6 +44,7 @@ const formatDate = (dateString: string): string => {
 
 export const CategoryDetail: React.FC = () => {
   const { slug } = useParams<{ slug: string }>()
+  const { t } = useI18n()
 
   const [posts, setPosts] = useState<Post[]>([])
   const [category, setCategory] = useState<Category | null>(null)
@@ -87,7 +89,7 @@ export const CategoryDetail: React.FC = () => {
 
         setPosts(categoryPosts)
       } catch (err) {
-        setError(err instanceof Error ? err.message : 'โหลดข้อมูลไม่สำเร็จ')
+        setError(err instanceof Error ? err.message : t('common.loadFailed'))
         console.error('Fetch data failed:', err)
       } finally {
         setLoading(false)
@@ -95,7 +97,7 @@ export const CategoryDetail: React.FC = () => {
     }
 
     fetchData()
-  }, [slug])
+  }, [slug, t])
 
   const items = useMemo(() => posts, [posts])
 
@@ -106,10 +108,10 @@ export const CategoryDetail: React.FC = () => {
       <main className="mx-auto w-full max-w-6xl px-4 py-10">
         <header className="mb-10">
           <h1 className="text-4xl font-semibold tracking-tight">
-            {category?.title ?? 'หมวดหมู่'}
+            {category?.title ?? t('categoryDetail.titleFallback')}
           </h1>
           <p className="mt-3 max-w-2xl text-zinc-600">
-            ข่าวสารทั้งหมดในหมวดนี้
+            {t('categoryDetail.subtitle')}
           </p>
         </header>
 
@@ -139,7 +141,7 @@ export const CategoryDetail: React.FC = () => {
 
         {!loading && items.length === 0 && !error ? (
           <div className="py-12 text-center text-zinc-600">
-            ยังไม่มีข่าวสารในหมวดนี้
+            {t('categoryDetail.empty')}
           </div>
         ) : null}
       </main>
diff --git a/src/pages/Home.tsx b/src/pages/Home.tsx
index 8e7e1c3..3e062d0 100644
--- a/src/pages/Home.tsx
+++ b/src/pages/Home.tsx
@@ -34,7 +34,7 @@ const stripHtml = (html: string): string => {
 
 const formatDate = (dateString: string): string => {
   const date = new Date(dateString)
-  return date.toLocaleDateString('th-TH', {
+  return date.toLocaleDateString(undefined, {
     year: 'numeric',
     month: 'long',
     day: 'numeric',
diff --git a/src/pages/Menu.tsx b/src/pages/Menu.tsx
index 03915cd..cbd4518 100644
--- a/src/pages/Menu.tsx
+++ b/src/pages/Menu.tsx
@@ -23,11 +23,13 @@ const formatPrice = (priceThb?: number) => {
   }).format(priceThb)
 }
 
-const getSpicyLabel = (locale: 'th' | 'zh', level: MenuItem['spicyLevel']) => {
-  return locale === 'zh' ? `辣度 ${level}/3` : `ระดับความเผ็ด ${level}/3`
+const getSpicyLabel = (locale: 'th' | 'zh' | 'en', level: MenuItem['spicyLevel']) => {
+  if (locale === 'zh') return `辣度 ${level}/3`
+  if (locale === 'en') return `Spice level ${level}/3`
+  return `ระดับความเผ็ด ${level}/3`
 }
 
-const SpicyDots: React.FC<{ level: MenuItem['spicyLevel']; locale: 'th' | 'zh' }> = ({
+const SpicyDots: React.FC<{ level: MenuItem['spicyLevel']; locale: 'th' | 'zh' | 'en' }> = ({
   level,
   locale,
 }) => {
diff --git a/src/pages/News.tsx b/src/pages/News.tsx
index aeff1d5..f3a78db 100644
--- a/src/pages/News.tsx
+++ b/src/pages/News.tsx
@@ -32,7 +32,7 @@ const stripHtml = (html: string): string => {
 
 const formatDate = (dateString: string): string => {
   const date = new Date(dateString)
-  return date.toLocaleDateString('th-TH', {
+  return date.toLocaleDateString(undefined, {
     year: 'numeric',
     month: 'long',
     day: 'numeric',
diff --git a/src/pages/PostDetail.tsx b/src/pages/PostDetail.tsx
index 51cac49..d7c42d4 100644
--- a/src/pages/PostDetail.tsx
+++ b/src/pages/PostDetail.tsx
@@ -25,7 +25,7 @@ const client = createClient({
 
 const formatDate = (dateString: string): string => {
   const date = new Date(dateString)
-  return date.toLocaleDateString('th-TH', {
+  return date.toLocaleDateString(undefined, {
     year: 'numeric',
     month: 'long',
     day: 'numeric',
@@ -112,7 +112,7 @@ export const PostDetail: React.FC = () => {
         <Header />
         <main className="mx-auto w-full max-w-6xl px-4 py-16">
           <div className="rounded-2xl border border-zinc-200 bg-white p-8 text-center shadow-sm">
-            <p className="text-red-700">{error || 'ไม่พบข้อมูลข่าวสาร'}</p>
+            <p className="text-red-700">{error || t('post.notFound')}</p>
             <div className="mt-6">
               <Link
                 to="/news"