Bismarck du Plessis, born May 22, 1984, in Bethlehem, Free State, South Africa, is a South African rugby union player, who plays for South Africa and for the Natal Sharks.

Du Plessis made his debut for the Sharks in the Super 14 (then the Super 12) in 2005. As he plays hooker and plays in the same team as South Africa’s captain, John Smit, for much of his career he has been a backup to Smit; however, this has changed with Smit’s recent move to tighthead prop. Before Smit’s change of position, du Plessis nonetheless played in the Super 14 and Currie Cup whenever Smit is unavailable, and in 2007 was selected to play for South Africa in the Tri Nations Series.

Du Plessis made his debut for South Africa as a substitute in the same game against Australia in Sydney in which his older brother, Jannie, who was in the starting XV, also made his Springboks debut.

Following an illness to Pierre Spies, Du Plessis was called into South Africa’s squad for the 2007 Rugby World Cup.

Du Plessis is now regarded as one of the best hookers in South African rugby.