The Ordnance QF 3.7-inch is a British artillery piece developed in the 1930s, primarily used during World War II. It is a quick-firing gun designed for anti-aircraft and field artillery roles, featuring a caliber of 3.7 inches (94 mm). The weapon was known for its versatility and effectiveness against both aircraft and ground targets. This artillery piece was mounted on various platforms, including towed and self-propelled versions. The QF 3.7-inch played a significant role in the defense of British forces, contributing to air defense strategies and supporting ground operations throughout the war.