Melissa Hauschildt (née Rollison, born 13 April 1983 in Adelaide) is an Australian professional triathlete and former middle distance runner.
She is a 3-time World Champion, winning Gold at the 2011 and 2013 Ironman 70.3 World Championship as well as the 2013 ITU Long Distance Triathlon World Championships.
She also won Silver at the 2016 Ironman 70.3 World Championships.
In April 2018, Hauschildt set a new Ironman brand record of 8:31:05, at the Ironman North American Championships, breaking the previous record of 8:33:56 set by Chrissie Wellington in 2011.
During Hauschildt's athletic career she has won 12 Australian Championship titles ranging in distance from 3000m on the track to the full Ironman distance in triathlon, she has set multiple National and World records in running and triathlon.
In 2001 she won Gold at the Goodwill Games Steeplechase and in 2006 she won Silver at the Commonwealth Games.
She has also won two team Bronze medals at the World Cross Country Championships in 2006 and 2008.