| Sebastián Montesinos | |
| Fullname: | Sebastián Francisco Javier Montesinos Pezoa |
| Birth Date: | 12 March 1986 |
| Birth Place: | Santiago, Chile |
| Position: | Defender |
| Youthclubs1: | Colo-Colo |
| Years1: | 2006 |
| Clubs1: | Curicó Unido |
| Caps1: | 14 |
| Goals1: | 0 |
| Years2: | 2007 |
| Caps2: | 8 |
| Goals2: | 0 |
| Years3: | 2007 |
| Clubs3: | Deportes Concepción |
| Caps3: | 11 |
| Goals3: | 0 |
| Years4: | 2008 |
| Clubs4: | San Marcos de Arica |
| Caps4: | 32 |
| Goals4: | 0 |
| Years5: | 2009 |
| Clubs5: | Cobreloa |
| Caps5: | 16 |
| Goals5: | 2 |
| Years6: | 2010 |
| Caps6: | 28 |
| Goals6: | 3 |
| Years7: | 2011–2014 |
| Clubs7: | Ñublense |
| Caps7: | 71 |
| Goals7: | 5 |
| Years8: | 2015–2016 |
| Clubs8: | Barnechea |
| Caps8: | 28 |
| Goals8: | 3 |
| Nationalyears1: | 2005 |
| Nationalteam1: | Chile U20 |
| Nationalcaps1: | 3 |
| Nationalgoals1: | 0 |
| Pcupdate: | 12:13, 2 March 2011 (UTC) |
| Ntupdate: | 12:13, 2 March 2011 (UTC) |
Sebastián Francisco Javier Montesinos Pezoa (born 12 March 1986) was a Chilean footballer who played as centre back.
His last team was then Primera B side A.C. Barnechea.