Jacobus Gideon Nel Strauss, known as Koos Strauss, Kosie Strauss or J. G. N. Strauss (17 December 1900 – 7 March 1990), was a South African politician who was the leader of the South African United Party from 1950 to 1956. He had earlier been minister of agriculture in the cabinet of Jan Smuts from 1943 until the defeat of the Smuts government in 1948. In the 1953 election the United Party under Strauss lost seven seats, while their opponents the National Party gained twenty-five more seats and a majority in Parliament. Following this election, the United Party suffered two splits, creating the Liberal Party and the Union Federal Party.