Olga Gray (1906–1990) was a British secretary and typist. She was recruited as an MI5 infiltration agent by Maxwell Knight of B5(b) Section in 1931. Under the instructions of Knight, Gray moved to London and became a member of the Friends of the Soviet Union in 1932. Knight's reasoning behind Gray's becoming a member of a pro-Soviet organisation but not actually offering to spy on Britain for the Soviet Union, was that the most successful counterespionage agents were those who were approached by the enemy organisation.