| Viengxay district | |
| Native Name Lang: | lo |
| Settlement Type: | District |
| Mapsize: | 300px |
| Mapsize1: | 150px |
| Subdivision Type: | Country |
| Subdivision Name: | Laos |
| Subdivision Type1: | Province |
| Subdivision Name1: | Houaphanh |
| Unit Pref: | Imperial |
| Timezone: | ICT |
| Utc Offset: | +7 |
Viengxay is a district (muang) of Houaphanh province in northeastern Laos.[1] It is home to the Viengxay caves, the Nam Et National Biodiversity Conservation Area,[2] and Phou Pha Thi mountain, site of the Secret War Battle of Lima Site 85 (LS-85) 11 March 1968.
Localities within the district include: