Melissa Breen (born 17 September 1990) is an Australian 100 metres and 200 metres runner.
Breen broke the Australian record for the women's 100 m sprint, when she clocked 11.11 seconds at the ACT Championships, held on 9 Feb 2014 at the Australian Institute of Sport track in Canberra under ideal conditions with a 1.9 mps following wind, warm conditions and 600+ metres elevation.
This broke a record previously held by Melinda Gainsford-Taylor, which had stood for more than 20 years.
Breen was selected to represent Australia at the 2012 Summer Olympics in the 100 m event.
She has won the Australian national championships in the 100 m event in 2010 and 2012.
She won the 200 m event at the national championships in 2009 and 2012.
She represented Australia at the 2010 Commonwealth Games in the 100 m event, finishing fifth in the semi-finals.