| Stockacher Aach | |
| Mouth Coordinates: | 47.8086°N 9.0338°W |
| Subdivision Type1: | Country |
| Subdivision Type2: | State |
| Subdivision Name2: | Baden-Württemberg |
| Length: | 38.3km (23.8miles) |
| Basin Size: | 243km2 |
Stockacher Aach is a river of Baden-Württemberg, Germany. It is a tributary to Lake Constance, which is drained by the Rhine. It passes through Stockach and flows into Lake Constance near Bodman-Ludwigshafen.