Thorill Gylder (born 5 May 1958) is a Norwegian female former racewalking athlete and speaker.

She also broke the 5000 metres race walk world record at Bislett Stadium in 1978.

She was a minor medallist at junior level at the Nordic Race Walking Championships in 1973 and 1975, behind Sweden's Siv Gustavsson and Monica Karlsson.

[5] Gylder was the dominant female walker nationally during her career, taking six consecutive 5000 metres race walk titles from 1975 to 1980 and seven straight titles in the 10 kilometres race walk discipline.

Her victories followed on from those of her sister, Gerd Gylder, who was also an international walker for Norway.