Fritz van Heerden (born 29 June 1970) is a former South African rugby union player who played international rugby for the Springboks, and club rugby with Western Province and Leicester Tigers.
He joined Leicester Tigers in 1998, following fellow South African Joel Stransky, and joining up with Martin Johnson, replacing Matt Poole who acquired a knee injury at about the same time with Dean Richards (normally a number eight) playing lock. Also able to play flanker, he complemented Johnson's more powerful play with mobility, but perhaps more importantly he pioneered the contesting of the opposition's line-out throws.
He returned to South Africa in 1999 to try to play for his country in the 1999 World Cup, and was drafted into the side late as a replacement for Selborne Boome, playing against Spain. After the World Cup, he returned to Leicester where he helped in the development of England lock Ben Kay. He then retired.