Simon Ross Harmer (born 10 February 1989) is a South African cricketer who has played 14 Test matches for the national team since 2015. A right arm off spinner and lower order batter, he has also played for the domestic clubs Essex in England since 2017 and Titans in South Africa since 2020. Harmer is the fifth South African to take over 1,000 wickets in first-class cricket.