Mavis Ngallametta (also known as Waal-Waal Ngallametta), née Marbunt, was an Indigenous Australian painter and weaver. She was a Putch clan elder and a cultural leader of the Wik and Kugu people of Aurukun, Cape York Peninsula, Far North Queensland. Her undertaking is held in national and divulge collections, including the National Gallery of Australia, Canberra; Art Gallery of New South Wales, Sydney; Art Gallery of South Australia, Adelaide and Gallery of Modern Art, Brisbane.