The Castle of Buitrago del Lozoya (Spanish: Castillo de Buitrago del Lozoya) is a castle located inside the walls of Buitrago del Lozoya, Community of Madrid region, Spain.

It was built in the 15th century in Gothic-Mudéjar style.

It has a rectangular plan, with seven towers of various shapes (round, pentagonal, square), all in stone.

It was declared Bien de Interés Cultural in 1931.

This article about a castle in Spain is a stub.