M1919 Browning machine gun Country USA Type Medium machine gun Manufacturer Browning Introduction 1919 Specifications Weight 31 lb (14 kg) (M1919A4) Length 37.94 in (964 mm) (M1919A4) 53 in (1346 mm) (M1919A6) Barrel length 24 in (609 mm) Cartridge .30-06 Springfield (U.S.) 7.62 x 51 mm NATO (U.S.) .303 British 8 mm Mauser Action Recoil-operated/short-recoil operation Rate of fire 400–600 round/min Effective range 1,500 yd (1,370 m) (maximum) Feed system 250-round belt

The Browning M1919 is a .30 caliber light machine gun family widely used during the 20th century. The M1919 was an air-cooled development of the standard U.S. machine gun of World War I, the Browning M1917, as designed by John M. Browning. It was used as a light infantry, coaxial, mounted, aircraft, and anti-aircraft machine gun by the U.S. and many other countries, especially during World War II, the Korean War, and the Vietnam War. Although it began to be superseded by newer designs in the later half of the century (such as by the M60 machine gun), it remained in use in many NATO countries and elsewhere for much longer.

Many M1919s were rechambered for the new 7.62 × 51 mm NATO round and served into the 1990s, as well as up to the present day in some countries. The United States Navy also converted many to 7.62 mm NATO, and designated them Mk 21 Mod 0; they were commonly used on river craft in the 1960s and 1970s in Vietnam.