Sisa is a heavily eroded Pleistocene stratovolcano in Hela, Papua New Guinea.

The taller of the mountain's two main peaks is estimated to be 2,650 metres (8,690 ft) high.

[1] The northern peak has a communications mast.

The epicentre of the 2018 Papua New Guinea earthquake was on the mountain's northern foothills.

[3] A tiny species of frogs, Choerophryne allisoni, is only known from its type locality on Mount Sisa.