The Great Western Railway (GWR) 1600 Class is a class of 0-6-0 pannier tank steam locomotive designed for light branch lines, short-distance freight transfers and shunting duties.

The class was based on the 2021 class designed by Dean and built from 1897 onwards. The 2021 class was in its turn an enlargement of the 850 class designed by Armstrong in 1874.

The 1600 Class was a pure GWR design but all 70 were built by the Western Region of British Railways. When the last member of the class was built in 1955, the basic design was over 80 years old; No. 1669 was the last one built, and in turn was the last GWR-design locomotive constructed at Swindon Works. BR gave the 1600 class the power classification 2F. The class's service life was short; withdrawals started in 1959 and all were gone by 1966.

70 were built, only 1 has been preserved.