Sally Pearson, 32, has battled injuries and setbacks throughout her illustrious hurdling career.
Sitting down on Sunrise on Tuesday, she announced that she was "hanging up her spikes" for good.
"When you count six injuries this year that no one knows about, and another whole year of training to try and win gold, I have major doubts my body will make it and I don't know if I want to put myself through that again," she said.
But Pearson says she won't be far removed from the athletics scene and is hoping to use her experience to inspire the next generation.
"Hopefully I can find paths that will lead me to somewhere that can help inspire the next generation, I suppose," she said.
"We have a great team coming through in our athletics, and I can't wait to see what they will do in Tokyo next year."
Pearson won a gold medal at the 2012 London Olympics and took silver in the 2008 Games in Beijing.
A two-time world champion, she still holds the Olympic record for the 100m hurdles.
She was awarded sport's highest honour in 2011 - the Best Female Athlete in the world.
This article originally appeared on 7News.