| Frías Castle | |
| Native Name: | Castillo de los Duques de Frías |
| Location: | Frías, Burgos, Spain |
| Type: | Castle |
| Ownership: | Ayuntamiento de Frías |
| Open To Public: | Yes |
| Condition: | Partly preserved |
| Built: | 10th century; rebuilt 15th century |
| Materials: | Stone |
Frías Castle is the castle of the Dukes of Frías, located in Frías (Burgos province), overlooking the Tobalina valley. It was built between the 12th and 15th century.