diff --git a/client/src/i18n/locales/en-US.ts b/client/src/i18n/locales/en-US.ts
index 1a31a88..b20c867 100644
--- a/client/src/i18n/locales/en-US.ts
+++ b/client/src/i18n/locales/en-US.ts
@@ -425,8 +425,6 @@ export default {
     vip: 'VIP',
     nationality: 'Nationality',
     nationalityPlaceholder: 'Select nationality',
-    nationalityKr: 'KR',
-    nationalityChn: 'CHN',
     email: 'Email',
     idType: 'ID Type',
     idNumber: 'ID Number',
@@ -449,7 +447,7 @@ export default {
       paymentTypeRequired: 'Select payment type.',
       paymentTypeAllowed: 'Only BTQR or CA are currently allowed.',
       nationalityRequired: 'Select nationality.',
-      nationalityAllowed: 'Only KR or CHN are currently allowed.',
+      nationalityAllowed: 'Only KR, CN, TH, MM, RS, or TW are currently allowed.',
       invalidEmail: 'Invalid email.',
     },
     errors: {
diff --git a/client/src/i18n/locales/th-TH.ts b/client/src/i18n/locales/th-TH.ts
index 4ccface..fbba17a 100644
--- a/client/src/i18n/locales/th-TH.ts
+++ b/client/src/i18n/locales/th-TH.ts
@@ -425,8 +425,6 @@ export default {
     vip: 'VIP',
     nationality: 'Nationality',
     nationalityPlaceholder: 'เลือก Nationality',
-    nationalityKr: 'KR',
-    nationalityChn: 'CHN',
     email: 'Email',
     idType: 'ID Type',
     idNumber: 'ID Number',
@@ -449,7 +447,7 @@ export default {
       paymentTypeRequired: 'กรุณาเลือก Payment Type',
       paymentTypeAllowed: 'รองรับเฉพาะ BTQR หรือ CA ในตอนนี้',
       nationalityRequired: 'กรุณาเลือก Nationality',
-      nationalityAllowed: 'รองรับเฉพาะ KR หรือ CHN ในตอนนี้',
+      nationalityAllowed: 'รองรับเฉพาะ KR, CN, TH, MM, RS หรือ TW ในตอนนี้',
       invalidEmail: 'รูปแบบ Email ไม่ถูกต้อง',
     },
     errors: {
diff --git a/client/src/i18n/locales/zh-CN.ts b/client/src/i18n/locales/zh-CN.ts
index bb0bddb..56a7d2f 100644
--- a/client/src/i18n/locales/zh-CN.ts
+++ b/client/src/i18n/locales/zh-CN.ts
@@ -424,8 +424,6 @@ export default {
     vip: 'VIP',
     nationality: '国籍（Nationality）',
     nationalityPlaceholder: '请选择国籍',
-    nationalityKr: 'KR',
-    nationalityChn: 'CHN',
     email: '邮箱（Email）',
     idType: '证件类型（ID Type）',
     idNumber: '证件号码（ID Number）',
@@ -448,7 +446,7 @@ export default {
       paymentTypeRequired: '请选择付款方式。',
       paymentTypeAllowed: '付款方式当前只允许 BTQR 或 CA。',
       nationalityRequired: '请选择国籍。',
-      nationalityAllowed: '国籍当前只允许 KR 或 CHN。',
+      nationalityAllowed: '国籍当前只允许 KR、CN、TH、MM、RS 或 TW。',
       invalidEmail: 'Email 格式不正确。',
     },
     errors: {
diff --git a/client/src/tests/roomingListService.spec.ts b/client/src/tests/roomingListService.spec.ts
index 460b8fa..565523a 100644
--- a/client/src/tests/roomingListService.spec.ts
+++ b/client/src/tests/roomingListService.spec.ts
@@ -19,7 +19,7 @@ function createInput(): RoomingListGenerationInput {
     departure: '2026-05-16',
     roomType: 'DLX',
     paymentType: 'CA',
-    nationality: 'CHN',
+    nationality: 'CN',
   }
 }
 
@@ -80,7 +80,7 @@ describe('roomingListService', () => {
     expect(formData.get('departure')).toBe('2026-05-16')
     expect(formData.get('room_type')).toBe('DLX')
     expect(formData.get('payment_type')).toBe('CA')
-    expect(formData.get('nationality')).toBe('CHN')
+    expect(formData.get('nationality')).toBe('CN')
     expect(formData.get('title')).toBeNull()
     expect(formData.get('rate_code')).toBeNull()
     expect(formData.get('adults')).toBeNull()
diff --git a/client/src/tests/roomingListView.spec.ts b/client/src/tests/roomingListView.spec.ts
index 131c2b1..bff9e45 100644
--- a/client/src/tests/roomingListView.spec.ts
+++ b/client/src/tests/roomingListView.spec.ts
@@ -86,7 +86,7 @@ async function fillRequiredFields(wrapper: ReturnType<typeof mountView>) {
   )
   await wrapper.find('[data-testid="rooming-list-people-per-room"]').setValue('2')
   await wrapper.find('[data-testid="rooming-list-room-type"]').setValue('DLX')
-  await wrapper.find('[data-testid="rooming-list-nationality"]').setValue('CHN')
+  await wrapper.find('[data-testid="rooming-list-nationality"]').setValue('CN')
 }
 
 describe('ReservationRoomingListGenerationView', () => {
@@ -188,7 +188,7 @@ describe('ReservationRoomingListGenerationView', () => {
       departure: '',
       roomType: 'DLX',
       paymentType: 'BTQR',
-      nationality: 'CHN',
+      nationality: 'CN',
     })
     expect(URL.createObjectURL).toHaveBeenCalledWith(expect.any(Blob))
     expect(HTMLAnchorElement.prototype.click).toHaveBeenCalledOnce()
@@ -216,6 +216,27 @@ describe('ReservationRoomingListGenerationView', () => {
     )
   })
 
+  it('allows submitting expanded nationality codes when selected', async () => {
+    vi.mocked(generateReservationRoomingListExcel).mockResolvedValue({
+      blob: new Blob(['xlsx-binary'], {
+        type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+      }),
+      fileName: 'rooming-list-HOTEL-TEST.xlsx',
+    })
+    const wrapper = mountView()
+    await fillRequiredFields(wrapper)
+    await wrapper.find('[data-testid="rooming-list-nationality"]').setValue('TH')
+
+    await wrapper.find('[data-testid="rooming-list-submit"]').trigger('click')
+    await flushPromises()
+
+    expect(generateReservationRoomingListExcel).toHaveBeenCalledWith(
+      expect.objectContaining({
+        nationality: 'TH',
+      }),
+    )
+  })
+
   it('submits optional manual stay dates when they are provided', async () => {
     vi.mocked(generateReservationRoomingListExcel).mockResolvedValue({
       blob: new Blob(['xlsx-binary'], {
diff --git a/client/src/views/reservation/ReservationRoomingListGenerationView.vue b/client/src/views/reservation/ReservationRoomingListGenerationView.vue
index d38b9f1..7e628e0 100644
--- a/client/src/views/reservation/ReservationRoomingListGenerationView.vue
+++ b/client/src/views/reservation/ReservationRoomingListGenerationView.vue
@@ -222,11 +222,12 @@
               >
                 {{ t('roomingList.nationalityPlaceholder') }}
               </option>
-              <option value="KR">
-                {{ t('roomingList.nationalityKr') }}
-              </option>
-              <option value="CHN">
-                {{ t('roomingList.nationalityChn') }}
+              <option
+                v-for="nationality in nationalityOptions"
+                :key="nationality"
+                :value="nationality"
+              >
+                {{ nationality }}
               </option>
             </select>
             <span
@@ -329,7 +330,8 @@ interface BackendDetailMessage {
 }
 
 const allowedPaymentTypes = new Set(['BTQR', 'CA'])
-const allowedNationalities = new Set(['KR', 'CHN'])
+const nationalityOptions = ['KR', 'CN', 'TH', 'MM', 'RS', 'TW']
+const allowedNationalities = new Set(nationalityOptions)
 
 const { t, te } = useI18n()
 const authStore = useAuthStore()