The Nimanburu were an Aboriginal Australian people of the Kimberley region of Western Australia.
The Nimanburu language was one of the Nyulnyulan languages. Their speech was described by other Aboriginal informants as a "heavy" dialect of the language spoken by the Warrwa.
Norman Tindale estimate Nimanburu tribal lands to extend over roughly 1200mi2 from the King Sound coast, around Repulse Point southwards to the swamp plain where the Fraser River debouches into the sea. Their inland extension ran as far as the headwaters of that river.
Despite being territorially a coastal people, the Nimanburu refrained from seafaring, and were not known to employ rafts as other contiguous groups in the King Sound did.