Tamsin Cook (born 25 December 1998) is an Australian swimmer and the former junior world champion in the 400-meter freestyle.

After a neck injury in 2018 she retired from swimming, but returned in 2020 and qualified for the 2020 Summer Olympics in Tokyo.

[6] In October 2015, Cook was named Western Australian Institute of Sport's Junior Athlete of the Year.

After a neck injury disqualified her from the 2018 Commonwealth Games, she retired from swimming in June 2018 to focus on her university studies.

Cook moved to the School of Isolated and Distance Education in year 11 to focus on her swimming.