| Official Name: | Castleton, Maryland |
| Pushpin Map: | Maryland#USA |
| Pushpin Label: | Castleton |
| Pushpin Label Position: | top |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Maryland |
| Subdivision Type2: | County |
| Subdivision Name2: | Harford |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 256 |
| Coordinates: | 39.6747°N -76.2147°W |
| Area Code: | 410 & 443 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 589912 |
Castleton is an unincorporated community in Harford County, Maryland, United States.