The Lancashire and Yorkshire Railway (L&YR) Class 23 is a class of 0-6-0ST steam locomotive. Their main use was for shunting and for short-trip freight working. They were initially built in 1876-87 by L&Y locomotive superintendent Barton Wright as a class of 280 0-6-0 tender engines. 230 of these were rebuilt as saddle tanks at Horwich Works by Aspinall between 1891 and 1900.

The class was long-lived, with the first engine being withdrawn in 1926 by the London, Midland and Scottish Railway and the last surviving in use until 1964 with British Railways London Midland Region. 101 were in service at Nationalisation, 20 still in service in 1961.

One locomotive, L&YR 752 (LMS 11456 but sold into colliery service 1937), is preserved by the Lancashire and Yorkshire Railway Trust, having been acquired by the NCB for continued operation. A sister locomotive, L&YR Class 25 no. 957, an 0-6-0 as built in original tender configuration, was also bought for preservation in 1959.