The castle of Santa Catalina is a fortification in Cádiz located in La Caleta, which juts out into the sea thanks to some breakwaters.

It is pentagonal in shape, and the star-shaped points jutting out into the sea are striking.

After the Anglo-Dutch assault of 1596, Philip II ordered Cristóbal de Rojas to build a defensive fortress by Royal Decree on 25 October 1597. The architect died before completing his project.

The final work was not as ambitious as planned.

During the reign of Charles II, the chapel and sacristy were built in 1693. This chapel is dedicated to Saint Catherine of Alexandria and the Immaculate Conception.

In 1769, Charles III turned it into a military prison for prominent personalities. American liberals and pro-independence fighters were held there and, at the end of the 20th century, some were involved in the coup d'état of 23 February 1981.