| Lam Wa | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Thailand |
| Subdivision Type2: | State |
| Subdivision Name2: | Nan Province |
| Subdivision Type4: | District |
| Subdivision Name4: | Bo Kluea, Santi Suk, Mae Charim, Wiang Sa |
| Source1: | Doi Phi Pan Nam |
| Source1 Location: | Luang Prabang Range, Bo Kluea District, Nan Province, Thailand |
| Source1 Coordinates: | 19.1625°N 101.2292°W |
| Source1 Elevation: | 1600m (5,200feet) |
| Mouth: | Nan River |
| Mouth Location: | Khueng, Wiang Sa District, Nan Province |
| Mouth Coordinates: | 18.5611°N 100.7636°W |
| Mouth Elevation: | 182m (597feet) |
Lam Nam Wa (th|ลำน้ำว้า) is a watercourse of the Thai highlands in Thailand, and a tributary of the Nan River, part of the Chao Phraya River basin. It has its source beneath the 1745m (5,725feet) high Doi Phi Pan Nam mountain of the Luang Prabang Range. It joins the Nan River near Wiang Sa town in Wiang Sa District, Nan Province.
Lam Nam Wa is a popular watercourse for white water rafting.[1]