| Birth Date: | 3 August 1904 |
| Birth Place: | Uskela, Salo, Finland |
| Death Date: | 8 February 1982 (aged 77) |
| Death Place: | Turku, Finland |
| Height: | 1.72m (05.64feet) |
| Weight: | 68kg (150lb) |
| Sport: | Athletics |
| Event: | 5000 m, 10000 m, marathon |
| Club: | Turun Riento, Turku |
| Pb: | 5000 m – 14:36.8 (1932) 10000 m – 30:30.7 (1933); Marathon – 2:48:53 (1935) |
| Show-Medals: | yes |
Lauri Johannes "Lasse" Virtanen (3 August 1904 – 8 February 1982) was a Finnish long-distance runner, winner of bronze medals in the 5000 metres and 10,000 metres at the 1932 Summer Olympics in Los Angeles. He finished fourth in the 5000 metres at the 1934 European Championships. His brother Eino was an Olympic wrestler.