Mariah Denigan (/ˈdɛnɪɡən/ DEN-ih-ghən; born May 3, 2003)[1][2] is an American swimmer, who specializes in open water and freestyle events.

At the 2022 FINA World Swimming Championships in Budapest Hungary, Denigan swim both the 10km open water (finishing 15th place), and the USA Mixed Team Relay (finishing in 7th).

Denigan won the silver medal in the women's 800 metre freestyle event at the 2019 Pan American Games held in Lima, Peru.

In the women's 400 metre individual medley event she finished in 5th place in the final.

This biographical article related to a United States swimmer is a stub.