This is a list of all British ship classes that served in World War II.
This list includes all British ship classes including those which did not serve with the Royal Navy or British military in general.
Heavy cruisers were defined by international agreement pre-war for the purposes of arms limitation as those with guns greater than 6-inch (152 mm); ships of guns of 6-inch or less were light cruisers.
Armed merchant cruisers[51][page needed] Several classes of Admiralty tug were operated as well as other vessels obtained