The LSWR X6 class was a class of express passenger 4-4-0 steam locomotives designed for the London and South Western Railway by William Adams.

Ten were constructed at Nine Elms Locomotive Works between 1895 and 1896.

[1] Some of the engines were subsequently fitted with a Drummond boiler, including No.

[2] All passed to the Southern Railway at the grouping in 1923.

This article relating to steam locomotives operated in England is a stub.