Schalk van der Merwe (16 April 1961 – 24 January 2016) was a professional tennis player from South Africa.

His best performance in a Grand Slam tournament was a third-round appearance at the 1982 US Open, where he had wins over Derek Tarr and Raúl Ramírez.

[1] In the second round of the 1982 Wimbledon Championships, van der Merwe lost a marathon match to Steve Denton, which had to be stopped due to darkness when the scores were level at 10–10 in the fifth set.

[2] Play resumed the following day, and Denton won 13–11.

While in Ireland, where he was working as a medical doctor, van der Merwe was found dead in his car.