The Serra del Cadí is a mountain range in the north of Catalonia, Spain, part of the Pre-Pyrenees.

The Llobregat River has its sources in Castellar de n'Hug at an altitude of 1,259 meters on the Serra del Cadí.

The present structure formed during the Tertiary as a consequence of the orogenesis of the Pyrenees and is characterized by its Alpine folding.

[2] This jagged mountain range was formerly a natural barrier hampering communication between Barcelona and Cerdanya, but the situation was resolved after the Cadí Tunnel was built together with the C-16 highway which follows the valley of the Llobregat.

[3] Believed to be extinct in Catalonia, the first wolf in 80 years was found recently in the Serra del Cadí.