| Sebastián Martínez | |
| Fullname: | Sebastián Ignacio Martínez Muñoz[1] |
| Birth Date: | 6 June 1993 |
| Birth Place: | Santiago, Chile |
| Height: | [2] |
| Position: | Defensive midfielder |
| Currentclub: | Universidad de Concepción |
| Youthclubs1: | Universidad de Chile |
| Years1: | 2011–2018 |
| Clubs1: | Universidad de Chile |
| Caps1: | 117 |
| Goals1: | 2 |
| Years2: | 2017–2018 |
| Clubs2: | → Huachipato (loan) |
| Caps2: | 20 |
| Goals2: | 0 |
| Years3: | 2018–2021 |
| Clubs3: | Huachipato |
| Caps3: | 45 |
| Goals3: | 0 |
| Years4: | 2021 |
| Clubs4: | → Palestino (loan) |
| Caps4: | 4 |
| Goals4: | 0 |
| Years5: | 2022 |
| Clubs5: | Barnechea |
| Caps5: | 26 |
| Goals5: | 0 |
| Years6: | 2023 |
| Clubs6: | Santiago Wanderers |
| Caps6: | 11 |
| Goals6: | 0 |
| Years7: | 2024– |
| Clubs7: | Universidad de Concepción |
| Caps7: | 0 |
| Goals7: | 0 |
| Nationalyears1: | 2013 |
| Nationalteam1: | Chile U20 |
| Nationalcaps1: | 12 |
| Nationalgoals1: | 0 |
| Nationalyears2: | 2014 |
| Nationalteam2: | Chile |
| Nationalcaps2: | 1 |
| Nationalgoals2: | 0 |
| Club-Update: | 25 January 2024 |
| Nationalteam-Update: | 31 January 2022 |
Sebastián Ignacio Martínez Muñoz (born 6 June 1993) is a Chilean footballer who plays as a midfielder for Universidad de Concepción.
He debuted on 22 October 2011, in a 1-1 draw of Universidad de Chile against Palestino for the 2011 Torneo Clausura, replacing Gabriel Vargas in the halftime.[3]
In 2024, he signed with Universidad de Concepción from Santiago Wanderers.[4]
He is the younger brother of Christian Martínez, also a product of the Universidad de Chile youth system.[5]