Petrus van der Walt Vermeulen (born 11 November 1988) is a former South African rugby union footballer. He played as a lock for the Cheetahs in Super Rugby and the Free State Cheetahs in the Currie Cup between 2009 and 2014, making 85 first class appearances. He retired during 2014, aged just 25, due to persistent injuries and to concentrate on his career as a doctor.