| Mariana Rossi | |
| Fullname: | Mariana Rossi |
| Birth Date: | 2 January 1979 |
| Birth Place: | Vicente López, Buenos Aires, Argentina |
| Position: | Defender |
| Currentclub: | St. Catherine's |
| Clubs1: | St. Catherine's |
| Nationalyears1: | 1997 |
| Nationalteam1: | Argentina U21 |
| Nationalyears2: | 2008–2014 |
| Nationalteam2: | Argentina |
| Nationalcaps2: | 102 |
Mariana Rossi (born 2 January 1979 in Vicente López, Buenos Aires) is an Argentine field hockey player, who won a bronze medal with the national women's hockey team at the 2008 Summer Olympics in Beijing. Mariana has also won the World Cup in 2010, two Champions Trophy (2008, 2010) and the gold medal at the Pan American Cup in 2013.