| Endenicher Bach | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | Location |
| Subdivision Name2: | Bonn, North Rhine-Westphalia |
| Subdivision Type3: | Reference no. |
| Subdivision Name3: | DE: 271982 |
| Length: | 11.565 km |
| Source1 Location: | South of Röttgen (near the Jakobskreuz) |
| Source1 Elevation: | ca. |
| Mouth Location: | In Endenich into the cities underground watersystem. |
| Mouth Elevation: | ca. |
| Basin Landmarks: | Cities: Bonn |
| Progression: | Dransdorfer Bach→ |
| Basin Size: | 28.298 km² |
| Custom Label: | References |
| Extra: | The underground part at Siemens Street |
Endenicher Bach ("stream of Endenich") is a river of North Rhine-Westphalia, Germany.
The Endenicher Bach is called Katzenlochbach at its origin but goes through some name changes on its way to a confluence with the Hardtbach (commonly known as the Dransdorfer Bach), which later flows into the river Rhine. It first changes into Endenicher Bach and later into Lengsdorfer Bach. With a length of 11km (07miles), it's the longest stream in Bonn.