W. G. Bagnall was a locomotive manufacturer from Stafford, England which was founded in 1875 and operated until it was taken over in 1962 by English Electric. The company was founded in 1875 by William Gordon Bagnall. The majority of their products were small four- and six-coupled steam locomotives for industrial use, and many were narrow gauge. They were noted for building steam and Diesel locomotives in standard and narrow gauges.
In 1951, the company was sold to Brush Electrical Engineering, becoming Brush-Bagnall Traction, Ltd. In 1959, Bagnall's merged with local engine manufacturer Dorman Diesels; however in 1962 both were taken over by English Electric Co Ltd. English Electric then formed English Electric Traction, which amalgamated the two companies with Robert Stephenson and Hawthorns and Vulcan Foundry (acquired in 1955 by English Electric) to bring all their railway activities under one set of management.