Willem Sterrenberg Jacobus Marais Bouwer (born 4 September 1985) is a South African rugby union footballer. He plays mostly as a flanker. He most recently represented the Pumas in the Currie Cup and Vodacom Cup having previously played for the Leopards. In 2013, he was included in a South Africa President's XV team that played in the 2013 IRB Tbilisi Cup and won the tournament after winning all three matches.