Mark Geyer OAM (born 7 December 1967), is an Australian former professional rugby league footballer who played in the 1980s, 1990s and early 2000s. An Australian international and New South Wales State of Origin representative second-rower, he is a rugby league media identity. Geyer's club career was played primarily with Penrith, with whom he won a premiership in 1991, as well as the Balmain Tigers and the Western Reds. He is also the brother of fellow former professional rugby league footballer Matt Geyer.