2-pounder gun, 2-pounder and QF 2 pounder or QF 2-pdr are abbreviations used for various guns which fired a projectile weighing approximately 2 pounds (0.91 kg). These include: * QF 2 pounder Mk II & Mk VIII "pom-pom" Vickers 40mm naval anti-aircraft autocannon of World War I and World War II * QF 2 pounder Mk XIV Rolls-Royce 40mm gun of World War II * QF 2 pounder Mk IX and Mk X British 40mm tank and anti-tank gun of World War II