Naval anti-aircraft guns include anti-aircraft guns specially designed or adapted for mounting on ships, and naval guns adapted for high-angle fire.
Caliber (mm) Number of barrels Weapon name Country of origin Period 20 1 or 2 Oerlikon 20 mm cannon World War II 20 4 Flakvierling 38 cannon World War II 20 1 Bofors akan m/40 World War II 25 1 or 2 Bofors lvakan m/32 Interwar 25 1, 2, or 3 Type 96 25 mm AT/AA Gun World War II 28 4 1.1"/75 (28mm) gun World War II 37 2 3.7 cm SK C/30 World War II 40 1, 4, or 8 QF 2 pdr Mk II, Mk VIII Vickers 2-pounder "pom-pom" World War I World War II 40 1, 2, or 4 Bofors 40 mm Automatic Gun L/60 World War II 45 1 or 2 45 mm anti-aircraft gun (21-K) World War II 76.2 QF 3 inch 20 cwt World War I 76.2 3"/23 caliber gun World War I - 1920s 76.2 1 or 2 3"/50 caliber gun World War I - World War II - Cold War 76.2 2 3"/70 Mark 26 gun Cold War 100 2 10 cm/65 Type 98 naval gun World War II 102 QF 4 inch Mk V naval gun World War I World War II 102 1 or 2 QF 4 inch Mk XVI naval gun World War II - Cold War 105 2 10.5 cm SK C/33 World War II 113 1 or 2 QF 4.5 inch Mk I - V naval gun World War II - Cold War 120 QF 4.7 inch Mk VIII naval gun 1920s - World War II 120 2 QF 4.7-inch Mk XI naval gun World War II - Cold War 120 1 or 2 Type 10 120 mm AA Gun 1921 - World War II 127 5"/25 caliber gun 1920s - World War II 127 2 12.7 cm/40 Type 89 naval gun 1932 - World War II 127 1 or 2 5"/38 caliber gun 1934 - World War II - Cold War 127 5"/54 caliber Mark 16 gun Cold War - Korean War 127 5"/54 caliber Mark 42 gun Cold War - Korean War - Vietnam War 133 2 QF 5.25 inch Mark I naval gun World War II 152 2 6"/47 caliber Mark 16 gun Cold War - Korean War 152 2 QF 6-inch Mark N5 gun Cold War