Judd is a name brand of engines produced by Engine Developments Ltd., a company founded in 1971 by John Judd and Jack Brabham in Rugby, Warwickshire, England. Engine Developments was intended to build engines for Brabham's racing efforts, and became one of the first firms authorised by Cosworth to maintain and rebuild its DFV engines, but has since expanded into various areas of motorsport.
Judd has provided engines for many major series, including Formula One and other smaller formula series, sports car racing, and touring car racing. They have been associated with manufacturers such as Yamaha, MG, and Honda, although they have mainly been a privateer engine supplier to customers. Judd is currently building the Lotus 2.2 Liter V-6 Twin-Turbocharged engine in the Izod Indycar Series.