For the moth genus, see Castulo (moth).

Castulo (Latin: Castulo; Iberian: Kastilo) was an Iberian town located in the Andalusian province of Jaén, in south-central Spain. Evidence of human presence since the Neolithic period has been found there. Oretans was the name of the Iberian tribe which settled in the vicinity in the north of the Guadalquivir River beginning in the 6th century BCE. Of tradition, a local princess named Himilce married Hannibal and gained the alliliance of the city with the Carthaginian Empire.

Cástulo fue una antigua ciudad íbera. capital de la Oretania, localizada muy cerca de la actual ciudad española de Linares, a 5 km siguiendo la carretera de Torreblascopedro.