Castelvittorio (, locally U Casté) is a comune (municipality) in the Province of Imperia in the Italian region Liguria, located about 120 km southwest of Genoa and about 30 km west of Imperia. Castelvittorio borders the following municipalities: Apricale, Bajardo, Isolabona, Molini di Triora, Pigna and Triora. The parish church of St. Stephen houses 16th or 17th century bas-relief, a Crucifixion of Jesus by Marcello Venusti (late 16th century) and a crucifix by Anton Maria Maragliano.