Mount Sir Thomas is a mountain in northwest South Australia. It in the Watarru Indigenous Protected Area, about southwest of Watarru. It is in the Birksgate Range, which is part of the traditional country of the Pitjantjatjara people. An important rock hole is located near the base of the mountain, called (sometimes written ), meaning "Emu Water". It is a major sacred site for the (Emu Dreaming).