| Tha Thung Na Dam | |
| Location Map: | Thailand |
| Location Map Caption: | Dam location in Thailand |
| Coordinates: | 14.2336°N 99.2358°W |
| Country: | Thailand |
| Location: | Mueang Kanchanaburi, Kanchanaburi |
| Purpose: | Multi-purpose |
| Status: | O |
| Opening: | 1981 |
| Dam Type: | G |
| Dam Crosses: | Khwae Yai River |
| Dam Height Foundation: | 30m (100feet) |
| Dam Length: | 840m (2,760feet) |
| Dam Width Crest: | 8m (26feet) |
| Res Name: | Tha Thung Na Reservoir |
| Res Capacity Total: | 54800000m2 |
| Res Elevation: | 59.7m (195.9feet) (MSL) |
| Plant Operator: | Electricity Generating Authority of Thailand |
| Plant Turbines: | 2 x 19 MW |
| Plant Capacity: | 38 MW |
| Website: | Tha Thung Na Dam at EGAT |
The Tha Thung Na Dam (Thai: เขื่อนท่าทุ่งนา,, in Thai pronounced as /kʰɯ̀a̯n tʰâː tʰûŋ nāː/) is a multi-purpose hydroelectric dam in the Mueang Kanchanaburi District of Kanchanaburi Province, Thailand. It impounds the Khwae Yai River. The dam is located at the southeastern corner of Erawan National Park.
Tha Thung Na Dam is a rock fill and concrete gravity dam. It is 840m (2,760feet) long and 30m (100feet) high. Its reservoir has a maximum storage capacity of 54800000m2.
The dam's power plant has two hydroelectric generating units, each with an installed capacity of 19 MW. The first unit was commissioned in December 1981 and the second unit in February 1982.