Castlegregory is a village in County Kerry, Ireland. It is situated on the north side of the Dingle Peninsula, halfway between Tralee and Dingle. As of the 2022 census, Castlegregory had a population of 370. Castlegregory was named after a castle built by Gregory Hoare in the 16th century. It is the principal village in Lettragh, the name given to the northern side of the Dingle Peninsula.