Other
- Castillo CF, football team from Gran Canaria, Canary Islands
- Castillo de Chapultepec, palace on Chapultepec Hill, located in the middle of Chapultepec Park in Mexico City
- Castillo de Guzman, castle in Tarifa, Spain
- Castillo de Jagua, fortress near Bahia de Cienfuegos, Cuba
- Castillo de San Marcos, old Spanish fort in St. Augustine, Florida, USA
- Castillo v. Texas, 2000 Texas court case regarding the sale of pornography
- Cad. FAP Guillermo del Castillo Paredes Airport, airport serving Tarapoto, Peru
- El Castillo, Chichen Itza, Mayan step-pyramid in Chichen Itza Yucatán, Mexico
- El Castillo de los Monstruos (disambiguation), multiple films
- El Castillo Interior, 1577 novel by Saint Teresa of Avila
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