| San Fernando | |
| Settlement Type: | Municipality and city |
| Subdivision Type: | Country |
| Subdivision Name: | Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Name1: | Andalusia |
| Subdivision Type2: | Province |
| Subdivision Name2: | Cádiz |
| Subdivision Type3: | Comarca |
| Subdivision Name3: | Bay of Cádiz |
| Subdivision Type4: | Judicial district |
| Subdivision Name4: | San Fernando |
| Subdivision Type5: | Commonwealth |
| Subdivision Name5: | Municipes of the Bahía de Cádiz |
| Coordinates: | 36.4667°N -18°W |
| Elevation M: | 8 |
| Area Total Km2: | 30.65 |
| Population Demonym: | Isleño |
| Population Density Km2: | auto |
| Blank Name Sec1: | Official language(s) |
| Blank Info Sec1: | Spanish |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 11100 |
| Area Code Type: | Dialing code |
| Leader Title: | Alcalde |
| Leader Name: | Patricia Cavada Montañés |
| Leader Party: | PSOE |
San Fernando (pronounced as /es/, "Saint Ferdinand") is a town in the province of Cádiz, Spain. It is home to more than 97,500 inhabitants. The city also uses the name "La Isla" (The Island). The people from San Fernando are locally known as "Cañaíllas" or "Isleños".
In history, the city played a paramount role when in 1810 during the French occupation led by Napoleon, San Fernando and Cádiz were the only parts of Spain which did not surrender to the French.
The deputies elected to the Cortes of Cádiz met in the Teatro Cómico, and started preparation of the first liberal constitution of Spain, which was approved in the neighbouring city of Cádiz in 1812.
Flamenco singer Camarón de la Isla was born in San Fernando.
It holds the Panteón de Marinos Ilustres.