Tisleifjorden is a lake on the border of Innlandet and Buskerud counties in Norway. The lake lies in Nord-Aurdal municipality in Innlandet county, as well in Gol and Hemsedal municipalities in Buskerud county. Tisleifjorden is dammed for hydroelectric power. The height of the lake sits around 819 m above sea level, but it can vary up to 11 m. The 13.54 km2 lake has a circumference of about 32.5 km. It is located about 25 km to the southwest of the town of Fagernes.

Dam

Tisleifjorden Dam creates a reservoir for the Åbjøra kraftverk hydro-electric power plant along the Aurdalsfjorden near the village of Aurdal. The power plant was built from 1949-1951 and it was rebuilt in 2002. Åbjøra kraftverk is operated by Skagerak Energi.