Josep Maria Vallès i Casadevall (born July 1940 in Barcelona) is a Spanish academic and politician.

Vallès studied law (UB), Political Science (IEP, in Paris) and Business Management (ESADE, Barcelona).

His research interests have been electoral systems and behaviour, local government and public policy.

Vallès was elected to the Parliament of Catalonia in 1999[2] and re-elected in 2003, as Barcelona candidate for Ciutadans pel Canvi (CpC), a civic association.

In 2003, he was appointed Minister of Justice in the Catalan Government presided by Pasqual Maragall.