| Coordinates: | 51.3839°N 9.0625°W |
| Location: | Waldeck-Frankenberg |
| Construction Began: | 1971[1] |
| Opening: | 1981 |
| Dam Crosses: | Twiste |
| Dam Height Foundation: | 23.51NaN1 |
| Dam Height Thalweg: | 21.51NaN1 |
| Dam Length: | 275m (902feet) |
| Dam Elevation Crest: | 216.51NaN1 |
| Dam Width Crest: | 6m (20feet) |
| Dam Width Base: | 135m (443feet) |
| Res Capacity Total: | 430000m2 |
| Res Capacity Active: | 9100000m2 |
| Res Catchment: | 125.1 km² |
| Res Surface: | 76 ha (0.76 km²) |
| Res Max Length: | 2.75 km |
| Res Max Width: | ca. 300 m |
The Twistesee is a reservoir on the Twiste in the county of Waldeck-Frankenberg in North Hesse, Germany.
The Twistesee is located at the northern end of the Langer Wald around 30 km as the crow flies west-northwest of Kassel between Bad Arolsen in the west, Volkmarsen to the northeast and Wolfhagen to the southeast. The reason for its construction was the so-called Henry Flood (Heinrichsflut) on 16/17 July 1965 that caused serious damage and destruction in the catchment areas of the Twiste and Diemel rivers. Near one riverside village, Wetterburg, the Twiste was impounded by a dam to form a very large flood retention basin in order to control the water level.
Among the sights in the vicinity of the Twistesee are: