| María Trinidad Castillo | |
| Birth Date: | 1956 10, df=y |
| Birth Place: | Coquimbo, Chile |
| Office: | Member of the Constitutional Convention |
| Constituency: | 5th District |
| Term Start: | 4 July 2021 |
| Term End: | 4 July 2022 |
| Party: | Close to Socialist Party[1] |
| Occupation: | Constituent |
| Profession: | Teacher of Biology |
María Trinidad Castillo Boilet[2] (born 4 October 1956) is a Chilean teacher who was elected as a member of the Chilean Constitutional Convention.