| Birth Date: | 24 April 1902 |
| Birth Place: | Eskilstuna, Sweden |
| Death Date: | 22 April 1990 (aged 87) |
| Death Place: | Örebro, Sweden |
| Sport: | Athletics |
| Event: | Sprint |
| Club: | SoIK Hellas |
| Pb: | 100 m – 11.0 (1922) 400 m – 49.8 (1921) |
| Show-Medals: | yes |
Carl Gustaf Olof Wejnarth (24 April 1902 – 22 April 1990) was a Swedish sprinter who competed in the 1924 Summer Olympics.[1] He won a silver medal in the relay and failed to reach the final of the individual 400 m event.