Mont Terri (804 metres; 2,638 ft) is one of the mountains of the Jura Mountains range. It is located south of Cornol in the Canton of Jura .

A prehistoric site, Mont-Terri Castle , is located on the summit.

The Mont Terri has an anticline structure and is the northernmost anticline of the folded Jura. The sedimentary rock layers of Jurassic age dip 42° into the direction of SSE. The Mont Terri anticline hosts different tunnel infrastructures.

A limestone underground quarry was first exploited by room and pillar mining for the "Fabrique de chaux" of Saint Ursanne until the 1980s.