Castro is a Romance language word that originally derived from Latin castrum, a pre-Roman military camp or fortification (cf: Greek: kastron; Proto-Celtic:*Kassrik; Breton: kaer, *kastro). The English-language equivalent is chester.
It may refer to:
- Castro (surname), a surname (including a list of people with the name)
- de Castro, a Portuguese surname
- House of Castro, a Spanish noble family
- Prince Carlo, Duke of Castro, claimant to the headship of the royal House of Bourbon-Two Sicilies
- A nickname of Martin Castrogiovanni (born 1981), Argentine-born Italian rugby player
- Castro (Brazilian footballer), the mononym of Luiz Felipe Castro Neto, Brazilian footballer
- Castro (Spanish footballer), the mononym of Santiago Castro Anido, Spanish footballer
Brazil
- Castro, Paraná, a municipality in the state of Paraná in the Southern Region of Brazil.
Greece
- Curiate Italian designation for the Latin Catholic titular bishopric of Moglæna, now Almopia, a municipality of the Pella regional unit in Greek Macedonia.
United States
- Castro County, Texas
- Castro Cove, an embayment of the San Pablo Bay in Richmond, California
- Castro Creek, a creek in Richmond, California
- Castro Street Station, a Metro station in San Francisco, California
- Castro Theatre, a movie theater in San Francisco, California
- The Castro, San Francisco, a neighborhood in San Francisco, California
- Castro Valley, California, a census-designated place in Alameda County