| Alejandro Alonso | |
| Fullname: | Alejandro César Alonso |
| Birth Date: | 3 March 1982 |
| Birth Place: | Buenos Aires, Argentina |
| Height: | 1.72 m |
| Position: | Midfielder |
| Years1: | 2001–2005 |
| Caps1: | 34 |
| Goals1: | 5 |
| Years2: | 2005–2008 |
| Caps2: | 83 |
| Goals2: | 4 |
| Years3: | 2008–2011 |
| Clubs3: | Monaco |
| Caps3: | 44 |
| Goals3: | 5 |
| Years4: | 2011–2013 |
| Caps4: | 29 |
| Goals4: | 1 |
| Totalcaps: | 190 |
| Totalgoals: | 15 |
Alejandro César Alonso (born 3 March 1982) is an Argentine former professional footballer who played as a midfielder. Having started his career with Club Atlético Huracán in Argentina, he went on play to for Girondins de Bordeaux, AS Monaco, and AS Saint-Étienne in France.
Alonso signed a two-year deal in January 2011 with Saint-Étienne.