| Rui Óscar | |
| Fullname: | Rui Óscar Neves de Sousa Viana |
| Birth Date: | 17 December 1975 |
| Birth Place: | Gondomar, Portugal |
| Position: | Defender |
| Youthyears1: | 1987–1994 |
| Youthclubs1: | Porto |
| Years1: | 1994–1995 |
| Caps1: | 17 |
| Goals1: | 1 |
| Years2: | 1995–1996 |
| Clubs2: | Leça |
| Caps2: | 27 |
| Goals2: | 0 |
| Years3: | 1996–1997 |
| Clubs3: | Porto |
| Caps3: | 1 |
| Goals3: | 0 |
| Years4: | 1997–2000 |
| Caps4: | 85 |
| Goals4: | 2 |
| Years5: | 2000–2004 |
| Caps5: | 71 |
| Goals5: | 1 |
| Years6: | 2004–2005 |
| Caps6: | 3 |
| Goals6: | 0 |
| Nationalyears1: | 1994 |
| Nationalcaps1: | 6 |
| Nationalgoals1: | 2 |
| Nationalyears2: | 1995–1996 |
| Nationalcaps2: | 14 |
| Nationalgoals2: | 0 |
| Nationalyears3: | 1995–1996 |
| Nationalcaps3: | 8 |
| Nationalgoals3: | 0 |
| Nationalyears4: | 2000 |
| Nationalteam4: | Portugal B |
| Nationalcaps4: | 1 |
| Nationalgoals4: | 0 |
Rui Óscar Neves de Sousa Viana, known as Rui Óscar (born 17 December 1975) is a former Portuguese football player.
He played 10 seasons and 187 games in the Primeira Liga for Marítimo, Boavista, Leça, Beira-Mar and Porto.
He made his Primeira Liga debut for Leça on 20 August 1995 in a game against Gil Vicente.[1]