| Birth Place: | Lycksele, Sweden |
| Height: | 178 cm |
| Weight: | 78 kg |
| Sport: | Cross-country skiing |
| Club: | Lycksele IF |
| Show-Medals: | yes |
Bror Sture Ragnvald Grahn (born 24 May 1932) is a retired Swedish cross-country skier. He finished tenth in the 50 km event at the 1956 Winter Olympics and won gold medals in the 4 × 10 km relay at the 1958 and 1962 World Championships. His wife Barbro Martinsson also competed in cross-country skiing at the 1956 Olympics.
| Year | Age | 15 km | 30 km | 50 km | 4 × 10 km relay |
|---|---|---|---|---|---|
| 25 | 18 | 18 | 12 | Gold | |
| 29 | — | — | — | Gold | |