Mawson Peak is an active volcanic summit of the Big Ben massif on Heard Island, an external Australian territory in the Indian Ocean. With an elevation of 2,745 metres, it is the third highest peak in any state, territory or claimed territory of Australia, higher than the 2,228-metre Mount Kosciuszko, and surpassed only by the 3,490-metre Mount McClintock and the 3,355-metre Mount Menzies in the Australian Antarctic Territory.