| Olav Nilsen | |
| Fullname: | Nils Olav Nilsen[1] |
| Birth Date: | 24 January 1942 |
| Birth Place: | Stavanger, Norway |
| Death Date: | [2] |
| Years1: | 1959–1975 |
| Clubs1: | Viking |
| Caps1: | 232 |
| Goals1: | 63 |
| Nationalyears1: | 1962–1971 |
| Nationalteam1: | Norway |
| Nationalcaps1: | 62 |
| Nationalgoals1: | 19 |
| Manageryears1: | 1975 |
| Managerclubs1: | Viking |
Nils Olav Nilsen (24 January 1942 – 11 October 2021) was a Norwegian footballer who played as a striker in his early career, but was later used as a midfielder. He scored 19 goals in 62 matches for the Norway national team.[3]
On club level Nilsen played for Viking, being team captain during their heyday in the early 1970s. With Nilsen a commanding figure, they won three league championships in 1972, 1973 and 1974. The supporters nicknamed him "Olav Viking".