Dicastillo (Basque: Deikaztelun) is a town and municipality located in the province and autonomous community of Navarre, northern Spain.

The Dicastillo festivals are in August, where a main focus is the music.

The notable buildings in Dicastillo are the hermitage and the church from the 16th century.

A famous music band from Dicastillo is called Banda Bizkarra.

Dicastillo has varied scenery, a notable mountain, Montejurra, and the Ega River where people can fish.