Dillenburg
| Dillenburg   | |
|---|---|
| Dillenburg - View on the Wilhelmsturm and the old town | |
| Location of Dillenburg   within Lahn-Dill-Kreis   district | |
| Coordinates: 50°44′N 08°17′E / 50.733°N 8.283°E | |
| Country | Germany | 
| State | Hesse | 
| Admin. region | Gießen | 
| District | Lahn-Dill-Kreis | 
| Government | |
| • Mayor (2019–25) | Michael Lotz (CDU) | 
| Area | |
|  • Total | 83.88 km2 (32.39 sq mi) | 
| Highest elevation | 590 m (1,940 ft) | 
| Lowest elevation | 230 m (750 ft) | 
| Population  (2023-12-31) | |
|  • Total | 23,028 | 
| • Density | 270/km2 (710/sq mi) | 
| Time zone | UTC+01:00 (CET) | 
| • Summer (DST) | UTC+02:00 (CEST) | 
| Postal codes | 35661–35690 | 
| Dialling codes | 02771 | 
| Vehicle registration | LDK, DIL | 
| Website | www.dillenburg.de | 
Dillenburg, officially Oranienstadt Dillenburg, is a town in Hesse's Gießen region in Germany. The town was formerly the seat of the old Dillkreis district, which is now part of the Lahn-Dill-Kreis.
The town lies on the German-Dutch holiday road called the Orange Route, joining towns, cities and regions associated with the House of Orange-Nassau, as well as on the German Timber-Frame Road and the Rothaarsteig hiking trail.