Pieter Rossouw de Klerk (born 21 August 1989) is a South African rugby union player for the Southern Kings in the Pro14. His regular playing position is tighthead prop. De Klerk began his senior career in Pretoria and made his domestic debut for the Blue Bulls in 2009 against the Griquas. The following year he made his first Super Rugby appearance for the Bulls against the Highlanders. In total he managed 33 matches for the Blue Bulls and 14 games for the Bulls. He moved west in 2013 and played for the Free State Cheetahs in the Vodacom Cup and Currie Cup competitions.