Mark Williams, Australian footballer and coach
Mark Melville Williams (born 21 August 1958) is a former Australian rules football player and coach. As a player, Williams represented Port Adelaide in the South Australian National Football League (SANFL) as well as Collingwood and Brisbane Bears in the Australian Football League (AFL) from the 1980s to the 1990s.

One of several successful father-son combinations in Australian rules football, Williams became a successful coach after finishing his playing career, leading Port Adelaide to their first AFL premiership in 2004.