| Settlement Type: | Town |
| Official Name: | San Diego, Cesar |
| Mapsize: | 200px |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Type2: | Department |
| Subdivision Name: | Colombia |
| Subdivision Name1: | Caribbean |
| Leader Title: | Mayor |
| Leader Name: | Juan Enrique Mendoza (Alas Equipo Colombia)[1] |
| Established Title: | Foundation |
| Area Footnotes: | [2] |
| Area Total Km2: | 687 |
| Population As Of: | Census 2018[3] |
| Population Total: | 18531 |
| Population Density Km2: | auto |
| Utc Offset: | -5 |
| Website: | alcaldiasandiego.com |
San Diego is a town and municipality in the Colombian Department of Cesar. It was founded on 19 July 1609.