| Óscar | |
| Fullname: | Óscar Vicente Martins Duarte |
| Birth Date: | 5 December 1950 |
| Birth Place: | Praia, Cape Verde |
| Position: | Midfielder |
| Years1: | 1969–1970 |
| Years2: | 1975–1976 |
| Years3: | 1976–1978 |
| Years4: | 1978–1979 |
| Years5: | 1979–1980 |
| Years6: | 1980–1981 |
| Years7: | 1981–1984 |
| Clubs1: | Santa Maria (Lsb) |
| Clubs2: | Sporting Covilhã |
| Clubs3: | Estoril-Praia |
| Clubs4: | FC Porto |
| Clubs5: | Boavista |
| Clubs6: | Académico |
| Clubs7: | Farense |
| Caps2: | 30 |
| Goals2: | 2 |
| Caps3: | 59 |
| Goals3: | 6 |
| Caps4: | 14 |
| Goals4: | 1 |
| Caps5: | 7 |
| Goals5: | 0 |
| Caps6: | 17 |
| Goals6: | 1 |
| Nationalyears1: | 1978 |
| Nationalteam1: | Portugal |
| Nationalcaps1: | 1 |
| Nationalgoals1: | 0 |
Óscar Vicente Martins Duarte (born 5 December 1950 in Praia), known simply as Óscar, is a former Portuguese footballer who played as midfielder.
He earned his only cap for the Portugal national football team on 8 March 1978, playing the last 12 minutes of a 2 - 0 friendly defeat to France at the Parc des Princes in place of fellow debutant José Alberto Costa.