| Birth Date: | 19 September 1919 |
| Birth Place: | Uppsala, Sweden |
| Death Date: | 31 December 2012 (aged 93) |
| Death Place: | Uppsala, Sweden |
| Height: | 175 cm |
| Weight: | 63 kg |
| Sport: | Athletics |
| Event: | 5000 m, 10,000 m |
| Pb: | 5000 m – 14:31.4 (1947) 10000 m – 30:10.0 (1951).[1] |
| Club: | IF Linnéa, Stockholm |
| Show-Medals: | yes |
Karl Bertil Karlsson (19 September 1919 – 31 December 2012) was a Swedish athlete who competed at the 1952 Summer Olympics in Helsinki. He finished 13th in the men's 10,000 metres event and was eliminated in the heats of the men's 5000 metres.[2] He was the Swedish champion in the 4,000 metre cross-country in 1949, the 5000 metre distance in 1950, and the 10,000 metre distance in 1952.[3] [4]