The Njakinjaki were an indigenous Australian people of southern Western Australia.
Njakinjaki traditional territory embraced some 12,000 square miles (31,000 km2) of land. They were east of Lake Grace, at Newdegate, Mount Stirling, Bruce Rock, Kellerberrin, and Merredin. Their western frontier was through to Jitarning. Their southern reaches went as far as Lake King, and Mount Madden. The eastern boundaries ran along the area close to Lake Hope and Mount Holland.