Tun Dr. Siti Hasmah binti Haji Mohamad Ali (born 12 July 1926) is the wife of the 4th and 7th Prime Minister of Malaysia, Tun Dr. Mahathir Mohamad. She served as wife of the Prime Minister of Malaysia for 22 years from 1981–2003. She is the oldest living wife of a former Malaysian prime minister.