| Birth Date: | 6 February 1906 |
| Birth Place: | Lund, Sweden |
| Death Date: | 16 April 1998 (aged 92) |
| Death Place: | Askim, Sweden |
| Height: | 1.81m (05.94feet) |
| Weight: | 76kg (168lb) |
| Sport: | Athletics |
| Event: | Decathlon, hurdles |
| Club: | SoIK Hellas |
| Pb: | Dec – 6565 (1933) 400 mH – 54.7 (1935) |
| Show-Medals: | yes |
Leif Evert Dahlgren (6 February 1906 – 16 April 1998) was a Swedish decathlete who won a silver medal at the 1934 European Championships. He competed at the 1936 Summer Olympics, but failed to finish.
Leif was the Swedish champions in pentathlon (1932, 1933, 1935, 1936), decathlon (1931–34), standing long jump (1933 and 1935) and 400 m hurdles (1934) and held the Swedish record in the standing long jump.