14 inch gun may refer to a number of 14 inch (355.6 mm) caliber naval guns of the 1900s - 1940s: 14"/45 caliber gun : US gun of World War I and World War II EOC 14 inch /45 naval gun : British gun of World War I later used by Chile 14"/50 caliber gun : US gun of World War I and World War II Vickers 14 inch/45 naval gun : gun used by Japan in World War I and World War II BL 14 inch Mk VII naval gun : British gun of World War II 14"/50 caliber railway gun