Mark Athorn (born 7 November 1967) is a former Australian rules footballer who played with Footscray, Fitzroy, Sydney and Carlton in the Australian Football League (AFL).
After being recruited from East Keilor he started his league career at Footscray and played three seasons for the Bulldogs.
He then spent a season each at Fitzroy and Sydney before crossing to his fourth and final club Carlton.
Although he spent most of the 1993 season in the reserves, where he was Carlton's 'Best and fairest' winner, Athorn played in the 1993 AFL Grand Final.
He was given the task of tagging Michael Long who won the Norm Smith Medal.