The QF 4.7-inch Gun Mks I, II, III, and IV^{[note 4]} were a family of British quick-firing 4.724-inch (120 mm) naval and coast defence guns of the late 1880s and 1890s that served with the navies of various countries. They were also mounted on various wheeled carriages to provide the British Army with a long range gun. They all had a barrel of 40 calibres length.

The gun was originally designed to replace the older BL 5-inch (127 mm) naval guns. It was optimised for the modern smokeless propellants, such as Cordite, and could be loaded and fired far more rapidly than the BL 5-inch gun while firing a shell only slightly lighter.

British forces in the Second Boer War were initially outgunned by the long range Boer artillery. Captain Percy Scott of HMS Terrible first improvised timber static siege mountings for two 4.7-inch (120 mm) guns from the Cape Town coastal defences, to counter the Boers' "Long Tom" gun during the Siege of Ladysmith in 1899–1900.^[7]Captain Scott then improvised a travelling carriage for 4.7-inch guns removed from their usual static coastal or ship mountings to provide the army with a heavy field gun. These improvised carriages lacked recoil buffers and hence in action drag shoes and attachment of the carriage by cable to a strong point in front of the gun were necessary to control the recoil.^[7] They were manned by Royal Navy crews and required up to 32 oxen to move.