Sidney O'Linn (5 May 1927 – 11 December 2016) was a South African sportsman who played Test cricket in seven Tests for South Africa between 1960 and 1961 and professional football for South Africa. Born Sidney Olinsky into a Jewish family, he was a left-hander who batted down the order. He was a member of the South African tour of England in 1960, the first to be confronted by anti-apartheid demonstrations, and scored 98 (his highest in Tests) in six hours at Trent Bridge before being caught in the slips by Colin Cowdrey.