Mawson Peak is an active volcanic mountain on Heard Island, an external Australian territory in the Southern Ocean. With its summit at , it is the second highest peak in any state or territory of Australia, higher than the 2,228-metre Mount Kosciuszko, and surpassed only by the  Mount McClintock in the Britannia Range in Australian Antarctic Territory. An active complex volcano which erupted as recently as April 2013 and February 2016, Mawson Peak is the summit of the Big Ben massif.