Brittany Castelluzzo

Brittany Castelluzzo (born 26 November 2000) is an Australian swimmer competing primarily in butterfly and freestyle events.

Career Castelluzzo represents the Tea Tree Gully Swimming Club in South Australia and trains with the South Australian Sports Institute (SASI) in Adelaide under coach Craig Stewart.

In 2025, Castelluzzo won the 200 m butterfly at the Australian Open Championships in a personal best time of 2:06.86. At the subsequent selection trials, she recorded a time of 2:06.91 to qualify for her long-course World Championships debut in Singapore. At the 2025 World Aquatics Championships, she reached the semifinals of the 200 m butterfly, placing ninth overall in 2:08.04. Following the season, SASI named her its 2025 Female Athlete of the Year.

At the 2026 Victorian Open Championships, Castelluzzo won four individual titles: the 100 m freestyle (54.30), 100 m butterfly (57.99), 200 m butterfly (2:07.89), and 200 m freestyle (1:57.64), while placing third in the 800 m freestyle. At the 2026 Australian Swimming Trials, she placed second in both the 200 m butterfly (2:06.95) and 100 m butterfly (57.88), earning selection for the Commonwealth Games and Pan Pacific Championships.

At the 2026 Commonwealth Games in Glasgow, she swam the second leg of Australia's heat in the women's 4 × 100 m freestyle relay, splitting 53.63 to help Australia qualify fastest for the final. Australia went on to win the gold medal in the final in 3:31.40.