| Built: | Mittelalterlich |
| Type: | lowland castle |
| Condition: | burgstall (no above-ground ruins) |
| Location: | Bischofsheim an der Rhön-Unterweißenbrunn |
| Coordinates: | 50.4005°N 10.0481°W |
| Map Type: | Germany |
| Code: | DE-BY |
Altenbrenda Castle was is a lowland castle, now reduced to a burgstall, located in the Großer Garten, 1000 metres northeast of the present village of Unterweißenbrunn in the borough of Bischofsheim an der Rhön in the Lower Franconian county of Rhön-Grabfeld in Bavaria.
The burgstall is situated near the sewage works for Unterweißenbrunn, in an area that is known today as the abandoned village (Wüstung) of Altenbrenda.