Calvin Donovan Marlin (born 20 April 1976 in Port Elizabeth, Eastern Cape) is a retired South African football goalkeeper who works as a goalkeeping coach for Cape Town City. He played club football for Michau Warriors, Seven Stars, Ajax Cape Town, SuperSport United, Mamelodi Sundowns and Mpumalanga Black Aces as well as representing South Africa internationally. Marlin was a participant at the 2002 FIFA World Cup. He was South Africa's first choice keeper at the 2006 African Nations Cup in Egypt and has so far been capped 16 times.