Sir Richard Gordon Turnbull was a British colonial governor and the last governor of the British mandate of Tanganyika from 1958 to 1961. Following the country's independence, he was governor-general from 9 December 1961 to 9 December 1962.
Richard Turnbull was chief secretary of Kenya during the Mau Mau Uprising. In 1958, he succeeded Edward Twining as governor of Tanganyika. Following the first elections to the Legislative Council, Turnbull appointed five members of Julius Nyerere's Tanganyika African National Union party. At the end of 1961, Tanganyika became independent with Nyerere as prime minister and Turnbull as governor-general. He served for a year until Tanganyika became a republic in December 1962. He later became the penultimate High Commissioner of Aden in 1965.