| Wilde Aa | |
| Mouth Location: | Orke |
| Mouth Coordinates: | 51.1533°N 8.7744°W |
| Subdivision Type1: | Country |
| Length: | 27.1km (16.8miles) |
Wilde Aa (in its lower course also: Aar) is a river of North Rhine-Westphalia and Hesse, Germany. It flows into the Orke near Lichtenfels.