Denia Castle is a castle that served as a fortress during the time of Mediterranean piracy. It is located on the highest point of the town of Denia, in the province of Alicante, Spain.

It is one of the elements that define the historical topography of the town centre. Remains of dwellings and fortifications from the Roman Diannium have been discovered on its slopes.

Its design dates back to the Islamic period, between the 11th and 12th centuries. Since then, different reforms have been reflected in its architecture. We highlight those of the Almohad period, the construction of the Red Tower and the Consell Tower in the 15th century, the bastions and other defensive systems in Renaissance style, as well as the rebuilding of the Governor's Palace in the 16th and 17th centuries, under the auspices of the Duke of Lerma, Marquis of Dénia.

The destruction of the Palace and the Vila Vella during the War of Succession and the abandonment of the military square in 1859 define the last centuries.

On 19th January 1812 it was occupied by French troops, who remained there until it was recovered by the Spaniards, after a siege that lasted from 15th June to 7th December 1813.

Today, the castle is an emblematic heritage site, the scene of conservation and restoration work, as well as innovative dissemination proposals.