| Erpa | |
| Source1 Location: | Near (a district of Zülpich) |
| Source1 Coordinates: | 50.7892°N 6.7617°W |
| Mouth Location: | North of Ahrem into the Lechenicher Mühlengraben |
| Mouth Coordinates: | 50.7892°N 6.7617°W |
| Progression: | Lechenicher Mühlengraben → Rotbach→ |
| Subdivision Type1: | Country |
| Subdivision Type2: | State |
Erpa is a river of North Rhine-Westphalia, Germany.
The Erpa springs near, a district of Zülpich. It is a left tributary of the Lechenicher Mühlengraben North of Ahrem, a district of Erftstadt. The Lechenicher Mühlengraben is a confluence of the Rotbach.