| Matías Orellana | |
| Birth Date: | 1988 12, df=y |
| Birth Place: | Rancagua, Chile |
| Office: | Member of the Constitutional Convention |
| Constituency: | 15th District[1] |
| Term Start: | 4 July 2021 |
| Term End: | 4 July 2022 |
| Party: | Socialist Party |
| Occupation: | Constituent |
| Profession: | Lawyer |
Matías Ignacio Orellana Cuellar[1] (born 22 December 1988) is a Chilean lawyer who was elected as a member of the Chilean Constitutional Convention.