| Schmale Sinn | |
| Mouth Location: | Sinn |
| Mouth Coordinates: | 50.2568°N 9.6416°W |
| Subdivision Type1: | Country |
| Subdivision Type2: | States |
| Length: | 32.4km (20.1miles) |
| Basin Size: | 104km2 |
Schmale Sinn (in its upper course in Bavaria: Kleine Sinn) is a river of Bavaria and Hesse, Germany. It is a right tributary of the Sinn near Zeitlofs. Via the Franconian Saale it discharges into the Main.