Grenchenberg, Mountain summit in the Jura, Bern and Solothurn, Switzerland

Grenchenberg is a high plateau west of the Weissenstein in the Swiss Jura, whose highest point is a ridge at 1,405 m above sea level. This ridge separates the French-speaking Jura from the German-speaking Mittelland and forms the border between the cantons of Bern and Solothurn. An asphalted road runs from Grenchen over the Grenchenberg to Court, and the Grenchenberg tunnel of the Jura railway passes beneath it.

The Grenchenberg is the 1,405 m ridge of the Swiss Jura that separates the French-speaking Jura from the German-speaking Mittelland and forms the cantonal border between Bern and Solothurn. The Jurabahn railway crosses beneath it through the Grenchenberg tunnel, and an asphalted road runs from Grenchen over the ridge to Court.

The name comes from the town of Grenchen on the mountain's south side, not from any border role. The ridge itself separates the French-speaking Jura from the German-speaking Mittelland and marks the Bern–Solothurn cantonal boundary. On the plateau, a wind turbine turns in the steady wind, and three more are planned by 2027.

An asphalted road runs from Grenchen over the Grenchenberg to Court, and buses of Busbetrieb Grenchen und Umgebung serve its southern section. Two ski lifts stand on the northern slope at around 1,300 m, the larger one built in 1958 and lengthened to 445 m in 1973. The Jurabahn's Grenchenberg tunnel passes beneath the plateau.

The Grenchenberg is crossed by the Grenchenberg railway tunnel of the Jurabahn, and its windy plateau hosts a wind turbine; three more are to be added by 2027, producing around 30 GWh a year together. The Jura observatory was built here in 1975/76 despite objections because the site lies in a protected Jura zone.