Datu Tucao Ong Mastura, CPA (Full: Datu Ahmad Tucao Ong Mastura bin Sultan Kudarat; born September 3, 1946, Sultan Kudarat, Maguindanao) is an influential Filipino politician.
He is the younger brother of the well known lawyer, historian, professor and former Maguindanao First District and Cotabato City Congressman Datu Michael Mastura, and an older brother of Mayor Datu Armando Mastura of Sultan Mastura, Maguindanao.
Datu Mastura is said to be the "kingmaker" of the Mastura clan, one of the biggest political families in Maguindanao.