| San Diego Fort | |
|---|---|
| Native name Fuerte de San Diego (Spanish) | |
 the remains today with Gibraltar in the background | |
| Location | Algeciras, Spain |
| Coordinates | 36°03′30″N 5°26′55″W / 36.0583°N 5.4486°W |
| Built | 1730 |
  Location of San Diego Fort in Province of Cádiz  Fuerte de San Diego (Spain) | |
The ruins of Fuerte de San Diego (Spanish: Fuerte de San Diego) are the remains of a castle located in Algeciras, Spain. The castle was built in 1730 following the Capture of Gibraltar in 1704.