Mount Sirung () is an active volcano complex volcano located on Pantar Island in the Alor archipelago of the eastern Indonesian province of Nusa Tenggara Timor. The crater rim can be reached by an easy hike from the village of Kakamauta. Inside the crater is a large sulphurous crater lake and several active steam vents. The last major eruption occurred 1970, and regular gas and clastic eruptions have occurred since 2004. A small eruption beginning May 12, 2012 triggered an evacuation of an area within a 1.5 km radius of the caldera.