| Birth Date: | 25 January 1893 |
| Birth Place: | Stockholm, Sweden |
| Death Date: | 20 August 1971 (aged 78) |
| Death Place: | Bromma, Stockholm, Sweden |
| Height: | 194 cm |
| Weight: | 92 kg |
| Sport: | Athletics |
| Event: | Shot put, discus throw, triple jump |
| Club: | Kronobergs IK, Stockholm |
| Pb: | SP – 13.14 m (1916) DT – 45.77 m (1916) TJ – 13.14 m (1916) |
| Show-Medals: | yes |
Oscar Edvin Herbert Zallhagen (né Andersson, 25 January 1893 – 20 August 1971) was a Swedish track and field athlete.[1] He competed in the discus throw at the 1920 Summer Olympics and placed fourth. Zallhagen won the national discus championships in England (1921) and in Sweden (1913–1922), finishing second in 1923. He was also a leading Swedish shot putter in 1914–1917.