Castillitos Battery, also known as the Battery of Punta de los Frailes, is a coastal artillery battery located on the southeast coast of Spain, near Cartagena in the region of Murcia. The battery was built between 1926 and 1933, and it served as part of the Spanish coastal defenses during the Spanish Civil War and World War II.

The battery features two large artillery pieces, each weighing more than 200 tons and capable of firing 381 mm shells over a distance of up to 35 kilometers. The guns are housed in fortified turrets built into the surrounding cliffs, which are themselves fortified with a series of bunkers, tunnels, and other defensive structures.

Despite its formidable size and power, the Castillitos Battery never saw active combat, and it was decommissioned in 1992. Today, the battery is a popular tourist attraction, offering visitors a glimpse into Spain's military history and providing stunning views of the surrounding coastline.