Lolo Soetoro Javanese pronunciation, also known as Lolo Soetoro Mangunharjo or Mangundikardjo, was an Indonesian geographer who was the ex-stepfather of Barack Obama, the 44th president of the United States.

Soetoro was born on 2 January 1935 in Bandung, West Java, as the ninth of ten children of Soewarno Martodihardjo (1897–1951), an employee of a mining office from Yogyakarta, and Djoeminah (born 1900). His brothers were Supoyo (1919–1955), Supomo (born 1921), Sugiyo (born 1925), Bambang Sugito (born 1927), and Soemitro Soetoro (born 1933), and his sisters were Cuk Muhsidi (born 1923), Titik Imam Sutiknyo (born 1929), Soewardinah (born 1931), and Uki Gunowiyono Soetoro. As of 2010, all of his siblings had died. Soetoro earned his bachelor's degree in geography from Gadjah Mada University, in Yogyakarta.In 1962, Soetoro, then a civilian employee of the Indonesian Army Topographic Service, obtained an East–West Center grant for graduate study in geography at the University of Hawaii at Manoa. He arrived in Honolulu in September 1962 and graduated from the university with a M.A. in geography in June 1964.