| Etonbury Castle | |
| Location: | Bedfordshire |
| Map Type: | Bedfordshire |
| Coordinates: | 52.0267°N -0.264°W |
| Map Size: | 200 |
| Type: | Castle |
| Condition: | Earthworks |
Etonbury Castle was a castle in the town of Arlesey, located near the road to Baldock, in the county of Bedfordshire, England .
An ancient timber castle, attributed to the Danes, Etonbury Castle had a ringwork and one or two baileys.
The site was destroyed by a railway leading through it. Only cropmarks and some earthworks remain.