Australia's four-time Olympic gold medallist Ariarne Titmus has retired from all levels of swimming.

Swimming Australia confirmed the 25-year-old's retirement on Thursday morning.

Titmus finished her career with eight Olympic medals across the Paris and Tokyo Games.

She successfully defended her Olympic title in the women's 400 metres freestyle at the Paris Olympics, becoming the first Australian athlete since Dawn Fraser in 1964, to win back-to-back gold medals in the same event. Loading

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