| Citadel of Port-Louis | |
| Map Type: | France Morbihan |
| Building Type: | Citadel |
| Client: | Juan del Águila |
| Location Town: | Port-Louis, Morbihan |
| Location Country: | France |
| Coordinates: | 47.7106°N -3.3638°W |
| Start Date: | 16th century |
| Architect: | Cristóbal de Rojas |
The Citadel of Port-Louis is a citadel built in the 16th century by the Spaniards, then modified in the 17th century by the Frenchmen in Port-Louis (France).
Used by Spain as a base of operations during the Brittany Campaign from 1590–1598.