| San Fernando Department | |
| Native Name: | Departamento de San Fernando |
| Native Name Lang: | es |
| Settlement Type: | Department of Chile |
| Mapsize: | 150px |
| Map Alt: | Location of San Fernando Department in the Libertador General Bernardo O'Higgins Region |
| Subdivision Type: | Country |
| Subdivision Name: | Chile |
| Subdivision Type1: | Former province |
| Subdivision Name1: | Colchagua |
| Parts Type: | Communes |
| Parts Style: | list |
| Parts: | List of 9: |
| P1: | San Fernando |
| P2: | Roma |
| P3: | Chimbarongo |
| P4: | Nancagua |
| P5: | Palmilla |
| P6: | Placilla |
| P7: | Matanzas |
| P8: | La Estrella |
| P9: | Pichilemu |
| Established Title: | Created |
| Seat Type: | Capital |
| Seat: | San Fernando |
| Timezone: | CLT[1] |
| Utc Offset: | -4 |
| Timezone Dst: | CLST[2] |
| Utc Offset Dst: | -3 |
The San Fernando Department (Spanish; Castilian: Departamento de San Fernando) was a Chilean department. In 1891, its capital was San Fernando, and comprised the communes of Roma, Chimbarongo, Nancagua, Palmilla, Placilla, Matanzas, La Estrella, and Pichilemu.[3]