| Castejón | |
| Settlement Type: | Municipality |
| Pushpin Map: | Spain |
| Pushpin Map Caption: | Location in Spain |
| Subdivision Type: | Country |
| Subdivision Name: |  Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Type2: | Province |
| Subdivision Name2: | Cuenca |
| Subdivision Type3: | Comarca |
| Subdivision Name3: | La Alcarria |
| Coordinates: | 40.3822°N -2.5475°W |
| Elevation M: | 910 |
| Area Total Km2: | 43,62 |
| Population Demonym: | Castejonero, castejonera |
| Population Density Km2: | auto |
| Blank Name Sec1: | Official language(s) |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 16856 |
| Area Code Type: | Dialing code |
| Leader Title: | Alcalde |
| Leader Name: | José Álvaro Martínez Duque (1987) |
| Leader Party: | PP |
Castejón is a municipality in the province of Cuenca, Castile-La Mancha, Spain. The municipality has 43.62 km2 and a population of 158 inhabitants, according to the 2015 census (INE).