| Unterer Hauenstein Pass | |
| Elevation M: | 691 |
| Location: | Switzerland |
| Range: | Jura Mountains |
| Coordinates: | 47.3814°N 7.8689°W |
Unterer Hauenstein Pass (el. 691 m.) is a mountain pass in the Jura Mountains between the canton of Basel-Country and Solothurn in Switzerland.
It connects Buckten in Basel-Country and Trimbach in Solothurn. The pass road has a maximum grade of 6 percent.
The pass was probably already used by the Romans. In 1993, Roman artifacts were discovered at the pass. It also lies close to the Roman settlement of Augusta Raurica.