Thea Louise Stjernesund (born 24 November 1996) is a Norwegian World Cup alpine ski racer and specializes in the technical events of slalom and giant slalom.

Competing at the 2016 and 2017 Junior World Championships, her best individual result was eighth in giant slalom, but she also won a mixed team bronze medal in 2016.

Stjernesund made her World Cup debut in October 2018 in the season opener at Sölden, and collected her first points with a ninth-place finish.

Her second-best result during the season was twelfth place in Andorra in March.

She was eighteenth in the giant slalom and fifth in the team event at the World Championships in February.