| Settlement Type: | Town |
| Official Name: | San Martín, Cesar |
| Mapsize: | 200px |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Type2: | Department |
| Subdivision Name: | Colombia |
| Subdivision Name1: | Caribbean |
| Leader Title: | Mayor |
| Leader Name: | Elber José Guerra (Convergencia Ciudadana)[1] |
| Established Title: | Foundation |
| Population As Of: | Census 2018[2] |
| Population Total: | 20452 |
| Utc Offset: | -5 |
| Website: | www.sanmartin-cesar.gov.co |
San Martín is a town and municipality in the Colombian Department of Cesar.