Jillian Janis Geohagan Crooks (born 27 June 2006) is a Caymanian competitive swimmer.

[7] At the 2020 Summer Olympics, held in 2021 due to the COVID-19 pandemic, in Tokyo, Japan, Crooks took 41st place in the 100 metre freestyle, not advancing to the semifinals with her Cayman Islands national record setting time of 57.32 seconds.

She was one of two Olympians to compete at the 2021 Alaska State High School Championship, the other being Alaska-born-and-raised Olympic gold medalist Lydia Jacoby who won breaststroke and individual medley events.

[14] At her first senior World Aquatics Championships, Crooks placed twenty-ninth in the 100 metre freestyle with a time of 57.24 seconds on day five of swimming competition at the 2022 World Aquatics Championships, held in June at Danube Arena in Budapest, Hungary.

[16] Six months later, as a 16-year-old at the 2022 World Short Course Championships in December in Melbourne, Australia, she placed twenty-fourth in the 50 metre butterfly with a Cayman Islands record time of 26.40 seconds.