| Lũng Cú | |
| Settlement Type: | Commune and village |
| Pushpin Map: | Vietnam |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Vietnam |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Hà Giang |
| Subdivision Type2: | District |
| Subdivision Name2: | Dong Van |
| Area Total Km2: | 35.89 |
| Population Total: | 3004 |
| Timezone: | UTC+7 |
| Utc Offset: | +7 |
| Coordinates: | 23.3583°N 105.3133°W |
Lũng Cú is a commune of Dong Van District, Hà Giang Province, Vietnam. It is located at the northmost end of Vietnamese territory. It is also very close to the Tropic of Cancer as of 2024. Administratively, this sector includes nine villages. It also includes the Lung Cu Flag Tower, marking the border between China and Vietnam.
Lung Cu commune village retains almost intact many traditional features of the Hmong people such as lifestyle, walled houses with tiled roofs. yin and yang.[1]