Mata Nui may refer to:

Mata Nui, a character in the Lego Bionicle series Mata Nui Online Game, a browser game Mata Nui Online Game II, the sequel to the game of the same name

See also Motu Nui, an islet near Easter Island Matanui, a genus of triplefin blennies Matanaui, a divergent Amazonian language