Bror Erik Byléhn (15 January 1898 – 14 November 1986) was a middle-distance runner from Sweden who competed at the 1924 and 1928 Olympics.
In 1924 he won a silver medal in the 4 × 400 m relay and failed to reach the finals of individual 400 m and 800 m races.
Four years later he won a silver medal in the 800 m, whereas his 4 × 400 m team finished in fourth place.Byléhn worked as a veterinary doctor in Karlstad, and later moved to the United States.