| Tämnarån | |
| River | |
| Country | Sweden |
|---|---|
| Mouth | Bothnian Sea |
| - location | Karlholmsbruk, Tierp Municipality |
| - elevation | 0 m (0 ft) |
| - coordinates | 60°31′26″N 17°38′55″E / 60.52389°N 17.64861°ECoordinates: 60°31′26″N 17°38′55″E / 60.52389°N 17.64861°E |
| Length | 99 km (62 mi) |
| Basin | 1,258.1 km2 (486 sq mi) |
Tämnarån is an approximately 60 km long river in the northern parts of the Swedish historical province Uppland.