The Derby dell'Enza, also referred to as the Derby del Parmigiano Reggiano, is the local derby contested by Emilian association football clubs Parma F.C. and A.C. Reggiana 1919. The name derives from the Enza river, which forms the boundary of the provinces of Parma and Reggio Emilia. The match is contested twice a year when the two clubs participate in the same league competition.