| Junior | |
| Fullname: | Mario dos Santos Júnior |
| Birth Date: | 27 October 1971 |
| Position: | Forward |
| Years1: | 1995 |
| Years2: | 1995–1996 |
| Clubs2: | FC Lokomotiv Nizhny Novgorod |
| Caps2: | 12 |
| Goals2: | 1 |
| Years3: | 1996 |
| Clubs3: | → FC Lokomotiv-d Nizhny Novgorod (loan) |
| Caps3: | 8 |
| Goals3: | 2 |
Mario dos Santos Júnior or simply Junior (born 27 October 1971) is a former Brazilian football player.[1] He and Luís André da Silva were the first Brazilian players in the Russian Football Premier League when they joined FC Lokomotiv Nizhny Novgorod in 1995.