Passwang Pass, Mountain pass in Solothurn, Switzerland.

Passwang Pass is a mountain crossing in the Swiss Jura, sitting in the canton of Solothurn and connecting Mümliswil-Ramiswil to the south with Beinwil to the north. A road tunnel passes through the summit itself, while the approach roads on both sides wind through forest and open meadow slopes.

The name Passwang appears around 1480 as boswand, later as Porschwand (1521) and Barschwang (1716); the linguist Rolf Max Kully derives it from Old High German bor, 'height', and swand, 'clearing'. The Passwangstrasse between Beinwil and Mümliswil is the only road crossing linking Solothurn's northern and southern parts, and it crosses the ridge diagonally. Near Neuhüsli below the north ramp, a 1598 landslide dammed a lake whose silted bed was already recorded in the 18th century.

The Jura region around the pass has long been shaped by farming and small crafts, and this is still visible today in the villages on both sides. Local dairy farms and small cheese producers continue to work the land much as they have for generations.

The pass is open year-round thanks to the tunnel, so driving through is possible even in winter, though the open road sections can be icy. Parking is available on both sides of the tunnel, giving easy access to the hiking trails that lead into the surrounding hills.

The pass forms part of the Schwarzbubenland cycling route, a regional path that threads together small villages and valleys rarely visited by travellers coming from outside the area. Cyclists can bypass the tunnel on older tracks that dip into the forest and offer a slower, quieter way through the hills.