Derbi is a manufacturer of motorcycles, scooters, mopeds and recreational all-terrain vehicles produced by Nacional Motor S.A.U., currently integrated into the Italian (2009) Piaggio Group.

Derbi's origins began with a little bicycle workshop in the village of Mollet near Barcelona, founded in 1922 by Simeó Rabasa i Singla (1901–1988).

Unlike Ossa, Bultaco, and Montesa, Derbi successfully met the challenges that followed the Spanish transition to democracy and Spain's entry into the European Community.

Simeó Rabasa i Singla died in 1988 but the company remained independent until 2001, when it was bought out by the Piaggio group.

The name Derbi is an acknowledgement of the company's history, and is an amalgamation from the Catalan-phrase Derivats de BIcicletes (derivatives of bicycles).