Mariano Puerta
| Country (sports) | Argentina | 
|---|---|
| Residence | Buenos Aires, Argentina | 
| Born | 19 September 1978 San Francisco, Córdoba, Argentina  | 
| Height | 1.80 m (5 ft 11 in) | 
| Turned pro | 1998 | 
| Retired | 2009 | 
| Plays | Left-handed (one-handed backhand) | 
| Prize money | US$1,781,372 | 
| Singles | |
| Career record | 128–118 | 
| Career titles | 3 | 
| Highest ranking | No. 9 (15 August 2005) | 
| Grand Slam singles results | |
| Australian Open | 2R (1999) | 
| French Open | F (2005) | 
| Wimbledon | 1R (1998, 2001, 2003,  | 
| US Open | 2R (1999,  | 
| Other tournaments | |
| Tour Finals | RR (2005) | 
| Doubles | |
| Career record | 42–54 | 
| Career titles | 3 | 
| Highest ranking | No. 68 (2 August 1999) | 
| Grand Slam doubles results | |
| Australian Open | 1R (1999, 2000, 2003) | 
| French Open | 2R (1999) | 
| Wimbledon | 1R ( | 
| US Open | 1R (1998, 2003,  | 
Mariano Rubén Puerta (Spanish pronunciation: [maˈɾjano ruˈβem ˈpweɾta]; born 19 September 1978) is an Argentine tennis coach and former professional player. He reached a career-high ATP world No. 9 singles ranking in August 2005. His career highlight is reaching the final of the French Open in 2005.
Shortly afterwards he tested positive for the banned substance etilefrine in a drugs test, for which he received an eight-year doping ban, subsequently reduced to two years on appeal.