| Hisayoshi Dam | |
| Name Official: | 久吉ダム |
| Dam Type: | G |
| Dam Crosses: | Hirakawa River |
| Country: | Japan |
| Location: | Hirakawa, Aomori Japan |
| Purpose: | FNW |
| Builder: | Obayashi Corporation |
| Operator: | Aomori Prefecture |
| Dam Length: | 317 meters |
| Dam Height: | 57 meters |
| Res Name: | Lake Omokage |
| Res Capacity Total: | 6,730,000 m³ |
| Res Capacity Active: | 6,070,000 m³ |
| Status: | O |
| Construction Began: | 1980 |
| Opening: | 1995 |
| Res Catchment: | 21.8 km² |
| Res Surface: | 41 hectares |
| Coordinates: | 40.4425°N 140.6919°W |
The is a dam located in the city of Hirakawa, Aomori Prefecture in the Tohoku region of Japan.
The dam is a concrete gravity dam across the Hirakawa River, a tributary of the Iwaki River. Construction on the dam was begun in 1980 by a consortium led by the Obayashi Corporation, and the dams as completed in 1995. across the Kodomari River. It is a multipurpose dam to provide water for irrigation, flood control and drinking water.