| Oreco | |
| Fullname: | Valdemar Rodrigues Martins |
| Birth Date: | 13 June 1932 |
| Birth Place: | Santa Maria, Brazil |
| Death Place: | Ituverava, Brazil |
| Position: | left back |
| Years1: | 1949 |
| Years2: | 1950–1957 |
| Years3: | 1957–1965 |
| Years4: | 1965–1968 |
| Years5: | 1968–1970 |
| Years6: | 1970–1972 |
| Clubs6: | Dallas Tornado |
| Caps6: | 38 |
| Goals6: | 0 |
| Nationalteam1: | Brazil |
| Nationalcaps1: | 9 |
Valdemar Rodrigues Martíns, best known as Oreco, (born in Santa Maria, Rio Grande do Sul, June 13, 1932 – April 3, 1985 in Ituverava, São Paulo) was a footballer who was on the winning team of the 1958 FIFA World Cup.