The GER Class S44 was a class of forty 0-4-4T steam locomotives designed by James Holden for the Great Eastern Railway.

They all passed to the London and North Eastern Railway at the 1923 grouping and received the classification G4.

These were the last 0-4-4T locomotives built for the Great Eastern Railway,[1] a type which, as side tanks, the GER had pioneered in Britain.

[2] The locomotives were all built at Stratford Works and had 17-by-24-inch (432 mm × 610 mm) inside cylinders driving 4-foot-11-inch (1.499 m) wheels.

[3] All were still in service at the 1923 grouping; the LNER adding 7000 to the numbers of nearly all the ex-Great Eastern locomotives, including the Class S44 locomotives.