Lake Wakatipu is an inland lake (finger lake) in the South Island of New Zealand. It is in the southwest corner of Otago Region, near its boundary with Southland.
With a length of 80 kilometres, it is New Zealand's longest lake, and, at 291 km², its third largest. It is at an altitude of 310 metres, towards the southern end of the Southern Alps. The general topography is a reversed "N" shape. The Dart River flows into the northern end, the lake then runs south for 30 kilometres before turning abruptly to the east. Twenty kilometres further along, it turns sharply to the south, reaching its southern end 30 kilometres further south, near Kingston.