Andrew Barclay Sons & Co. are a builder of steam and later fireless and diesel locomotives. The company's history dates to foundation of an engineering workshop in 1840 in Kilmarnock, Scotland.
After a long period of operation, the company was acquired by the Hunslet group in 1972 and renamed Hunslet-Barclay; in 2007 the company changed hands after bankruptcy becoming Brush-Barclay as part of the FKI Group. In 2011 Brush Traction and Brush-Barclay were acquired from FKI by Wabtec. The site was acquired by Brodie Engineering Ltd in July 2020.