The Vallo di Diano (also known as Valdiano) is an Italian valley of the south-eastern side of Campania, in the province of Salerno.

Situated between the Alburni mountains and the borders of Campania with Basilicata, it is considered a geographical subregion of Cilento and is part of the Cilento and Vallo di Diano National Park, World Heritage Site of Italy from 1998.

The greatest forestal park, mainly located in cilentan side, is Pruno.

The valley is served by the A2 motorway Salerno-Reggio Calabria, with the exits of Petina,[1] Polla, Atena Lucana, Sala Consilina and Padula-Buonabitacolo.

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