Thea Helseth (born 10 June 1996) is a Norwegian competitive rower.

Her achievements include winning several national titles, and a gold medal in double scull at the 2024 European Rowing Championships.

[2] Helseth has won several national titles in single scull, in 2016, 2017, 2018 and 2021.

[3] She won a gold medal in double scull at the 2024 European Rowing Championships, along with Inger Kavlie.

[4] Along with Kavlie she won the double scull overall World Rowing Cup in the 2024 season.