| Mariano Juan | |
| Fullname: | Mariano Alcides Juan |
| Birth Date: | 15 May 1976 |
| Birth Place: | Buenos Aires, Argentina |
| Position: | Midfielder |
| Years1: | 1994–1996 |
| Years2: | 1996–2000 |
| Years3: | 1998–1999 |
| Years4: | 2000–2002 |
| Years5: | 2002–2003 |
| Years6: | 2003–2006 |
| Years7: | 2006–2007 |
| Clubs3: | → Racing Club (loan) |
| Clubs7: | CD Leganés |
| Caps1: | 7 |
| Caps2: | 17 |
| Caps3: | 5 |
| Caps6: | 84 |
| Caps7: | 29 |
| Goals1: | 0 |
| Goals2: | 0 |
| Goals3: | 0 |
| Goals6: | 2 |
| Goals7: | 0 |
| Nationalyears1: | 1995 |
| Nationalteam1: | Argentina U20 |
| Nationalcaps1: | 5 |
| Nationalgoals1: | 0 |
Mariano Alcides Juan (born 15 May 1976 in Buenos Aires) is a retired Argentine association football player who played in Argentina for River Plate, Racing and Huracán, in the Netherlands for Ajax, and in Spain for Getafe CF, CD Toledo and CD Leganés.