Kaylee Rochelle McKeown OAM (/məˈkjuːən/ mə-KEW-ən; born 12 July 2001) is an Australian swimmer and quintuple Olympic gold medalist.

[9][10] McKeown earned her first senior international medal for swimming the heats of the mixed medley relay, in which Australia placed second in the final.

[15] Leading up to the 2020 Summer Olympics, McKeown was the fastest swimmer in the 200 metre individual medley but withdrew from the event to concentrate on the backstroke.

McKeown then transferred to Griffith University Swimming Club on the Gold Coast to train under Michael Bohl, who was best known for coaching Olympic Champions Emma McKeon and Stephanie Rice.

[32] She concluded the session with a silver medal in the 4×100 metre medley relay, leading-off with a 55.74 for the backstroke portion to help finish in an Oceanian, Commonwealth, and Australian record time of 3:44.92.

[33] At the beginning of the 2023 season, McKeown broke the long course 200 metre backstroke world record at the 2023 NSW State Open Championships.

[36][37][38] McKeown became only the second swimmer to ever win the 50, 100 and 200 metre events of the same stroke during the same championships, after China's Qin Haiyang completed the breaststroke sweep the day prior.

a split 58.01 for backstroke leg; with Chelsea Hodges (breaststroke), Emma McKeon (butterfly), Cate Campbell (freestyle) In August 2020, McKeown's father, Sholto, died after a two-year battle with brain cancer.

[60] McKeown has been dating fellow Australian national team member and 2020 Olympian Brendon Smith since November 2021.Brendon and Kaylee broke up their relationship in August 2024, after the Olympic Games [2]