Torre del Tostón, Military fortress in El Cotillo, Fuerteventura, Spain.

Torre del Tostón is a circular stone structure with two floors and a vaulted ceiling, positioned strategically to overlook the Atlantic Ocean. The building features thick walls and an open platform at the top, providing wide views across the water.

Jean de Bethencourt built the first defence tower here, El Castillo de Rico Roque, in the early years of the Canary Islands colonisation. Around 1700 the military engineer Claudio de L'Isle replaced it with the present Torre de Nuestra Señora del Pilar y San Miguel, whose three iron cannons guarded the coast and the boats anchored in El Cotillo's port against Barbary, English and French pirates. It was listed as a historic-artistic monument in 1949.

The tower has been a Bien de Interés Cultural since 1949. Local artists now use it as an exhibition room, and it is one of Fuerteventura's main tourist destinations, also serving as a viewpoint.

The tower stands at the edge of El Cotillo's harbour, so it can be reached on foot from the village centre. Access to the upper level is by an external staircase; the interior is used for temporary art exhibitions, so opening depends on the show. The surrounding bay and the harbour wall are visible from the outside at any time.

The tower is one of a series of lookouts built to the same design across the Canaries; sources pair it with the Castillo de San Andrés in Tenerife, the towers of Gando and San Pedro in Gran Canaria, the castle of Caleta de Fuste on Fuerteventura and the Torre del Águila in Lanzarote. It has been listed as a historic-artistic monument since 1949.