Flatåker is a village in Hol Municipality, in Buskerud, Norway. Flatåker lies at 820 m above sea level, in the Hardangervidda mountains. The nearest city is Kongsberg, 116 km to the southeast. Among the landmarks around are Hol Church (14.9 km), Skurdalen Church (1.1 km) and Geilo kyrkje (9.1 km). Among the natural features are Skarvsenden (17.3 km) and Godfarfossen (17.2 km).