| Kaj Frederiksen | |
| Birth Place: | Gørlev, Denmark |
| Birth Date: | 21 September 1916 |
| Death Place: | Hillerød, Denmark |
| Occupation: | boxer |
| Relatives: | Kaj Frederiksen (twin brother) |
Viggo Frederiksen (21 September 1916 - 11 December 1993) was a Danish boxer who competed in the 1936 Summer Olympics.
He was born in Gørlev and died in Hillerød. He was the twin brother of Kaj Frederiksen.
In 1936 he was eliminated in the first round of the bantamweight class after losing his fight to Oscar de Larrazábal.