| Reichenstein Castle | |
| Native Name: | Burg Reichenstein |
| Location: | Trechtingshausen |
| Country: | Germany |
| Type: | Medieval castle |
| Coordinates: | 50.0051°N 7.8535°W |
| Pushpin Map: | Germany |
| Built: | 1100 |
Reichenstein Castle (German: Burg Reichenstein), also known as Falkenburg is a castle in the UNESCO World Heritage Site of the Upper Middle Rhine Valley. It stands on a mountain spur on the eastern slope of the Bingen Forest, above the Rhineland-Palatinate municipality of Trechtingshausen in the Mainz-Bingen district in Germany.