| Alte Emscher | |
| Mouth Location: | Rhine |
| Mouth Coordinates: | 51.4957°N 6.7181°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | State |
| Subdivision Name2: | North Rhine-Westphalia |
Alte Emscher is a river of North Rhine-Westphalia, Germany. It is the former lower course of the Emscher. It flows into the Rhine near Hamborn (Duisburg).