Tomas Pettersson (born 15 May 1947) is a retired Swedish cyclist. He was part of the road racing team of four Pettersson brothers, known as Fåglum brothers, who won the world title in 1967–1969 and a silver medal at the 1968 Olympics. In 1967 they were awarded the Svenska Dagbladet Gold Medal.
Petterson turned professional after the 1969 World Championships, together with the other brothers. He rode the Tour de France in 1970 and 1971, and won the 1970 Trofeo Baracchi (together with brother Gösta). He retired prematurely in 1973, and later regretted that decision.