Vermaak is an Afrikaans surname. Notable people with the surname include:
- Coen Vermaak, leader of the Boerestaat Party
- Ian Vermaak (born 1933), South African tennis player
- Jano Vermaak (born 1985), South African rugby union player
- Yvonne Vermaak (born 1956), South African-born American tennis player
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