| Birth Date: | 15 September 1901 |
| Birth Place: | Stockholm, Sweden |
| Death Date: | 4 March 1981 (aged 79) |
| Death Place: | Johanneshov, Sweden |
| Height: | 1.76m (05.77feet) |
| Weight: | 60kg (130lb) |
| Sport: | Athletics |
| Event: | 5,000 m; 10,000 m |
| Club: | Fredrikshofs IF, Stockholm |
| Pb: | 1500 m – 4:00.6 (1930) 5000 m – 14:43.8 (1933) 10000 m – 31:14.4 (1929) |
| Show-Medals: | yes |
Ragnar Karl Magnusson (15 September 1901 – 4 March 1981) was a Swedish long-distance runner. He competed at the 1928 Summer Olympics in the 5,000 and 10,000 m events and finished in fifth and sixth place, respectively. Magnusson held Swedish titles in the 5,000 m in 1930, 1932 and 1933 and in the 10,000 m in 1932.