Tun Dr. Siti Hasmah binti Haji Mohamad Ali (born 12 July 1926) is the spouse and wife of Mahathir Mohamad, the 4th and 7th Prime Minister of Malaysia. She played the role of Spouse of the Prime Minister of Malaysia from July 1981 to October 2003 and from May 2018 to March 2020 for almost 24 years. She is the oldest-living person of the role.