Italy
- Castro, municipality of the province of Lecce
- Castro, municipality of the province of Bergamo
- Castro dei Volsci, municipality of the province of Frosinone
- Arlena di Castro, municipality of the province of Viterbo
- Caves of Castro, municipality of the province of Viterbo
- Ischia di Castro, municipality of the province of Viterbo
- Montalto di Castro, municipality of the province of Viterbo
- Castrogiovanni, ancient name of Enna
- Castro, an ancient city of Lazio destroyed in 1649, capital of the homonymous Duchy. Today part of Ischia di Castro
Brazil
Chile
- Castro, city of Southern Chile
Portugal
- Castro Daire, Portuguese municipality in the district of Viseu
- Castro Marim, Portuguese municipality in the district of Faro
- Castro Verde, Portuguese municipality of the Beja district
Spain
- Castellanos de Castro
- Castro Caldelas
- Castro de Filabres
- Castro de Fuentidueña
- Castro de Rei
- Castro del Río
- Castro-Urdiales
- The Puebla de Castro
- Olmillos de Castro
- Olula de Castro
- Perilla de Castro
- Piedrahita de Castro
- San Cebrián de Castro
- Villaornate y Castro
Switzerland
- Castro, locality of Canton Ticino aggregated to the municipality of Acquarossa
United States of America
- Castro Valley, city of Alameda County, California
- The Castro, neighborhood of San Francisco, California
Other
- Castro Pretorio, Rome district