The L&YR Class 27 is a class of 0-6-0 steam locomotive designed for freight work on the Lancashire and Yorkshire Railway. They were designed by John Aspinall and 484 were built between 1889 - 1918 at Horwich Works. It was the standard goods engine used by the Lancashire & Yorkshire Railway. By the time Aspinall became general manager of the L&YR on 1 July 1899 more than 400 of the simple but powerful engines had been built. More were built under his successors, Henry Hoy and George Hughes, albeit with some modifications. By 1918 there were the 484 locomotives in the class.

It is a tribute to the soundness, usefulness and simple practicality of Aspinall's design that 300 of the class passed into the ownership of the London, Midland and Scottish Railway and around 50 were operating in British Railways service in summer 1960. British Railways had taken ownership of 235 of the class in 1948. 32 locomotives were loaned to the Railway Operation Division during World War I, all of them were eventually returned once the war had ended.

Of the 484 built only 1 has survived into preservation.