| Steinfurter Aa | |
| Mouth Location: | Vechte |
| Mouth Coordinates: | 52.2515°N 7.2958°W |
| Subdivision Type1: | Country |
| Subdivision Type2: | State |
| Length: | 46.4km (28.8miles) |
| Basin Size: | 205km2 |
Steinfurter Aa is a river of North Rhine-Westphalia, Germany. It flows through Steinfurt, and joins the Vechte near Wettringen.