The BR Standard Class 4 2-6-0 is a class of steam locomotive designed by Robert Riddles for British Railways (BR). The Standard Four Mogul was essentially a standardised version of the LMS Ivatt Class 4 and was primarily intended for freight use. An axle-loading of only 16 long tons 15 cwt meant its route availability was virtually unrestricted. Batches were allocated to every BR region except the Western.

115 locomotives were built to this standard. 4 have been preserved.