Frederick Barend Christoffel Kirsten (born 18 August 1988) is a former South African rugby union professional footballer that played as a prop. He represented the Bulls in the international Super Rugby competition between 2009 and 2014 and the Blue Bulls in the domestic Currie Cup and Vodacom Cup competitions between 2008 and 2013, making 81 first class appearances for the Pretoria-based side. After making his first class debut during the 2008 Vodacom Cup, he made his Super Rugby debut against the Blues in 2009 and his Currie Cup debut in 2009 against Western Province in the same year.