Mark Hartnett

 Mark Hartnett (born 1960s) is an Australian former professional tennis player.

Hartnett, a top ranked Victorian junior, was trained at the AIS and won the boys' doubles title at the 1982 Australian Open. A left-handed player, he was a contemporary of Pat Cash and often partnered with the future Wimbledon winner in junior tournaments.

Now a tennis coach, Hartnett runs the Pro Tennis Academy in Melbourne with his wife, former player Lisa Keller. He was named Tennis Victoria Coach of the Year in 2003.