20 mm artillery

The Becker Type M2 20 mm cannon was a German automatic cannon developed for aircraft use during World War I by Stahlwerke Becker.

2.8 cm schwere Panzerbüchse 41 (sPzB 41) or "Panzerbüchse 41" was a German anti-tank weapon working on the squeeze bore principle.

The Berezin B-20 (Березин Б-20) was a 20 mm caliber autocannon used by Soviet aircraft in World War II.

The RT-20 is a Croatian anti-materiel sniper rifle developed by Metallic in Rijeka in the mid-1990s and marketed by RH-Alan.

The M61 Vulcan is a hydraulically or pneumatically driven, six-barrel, air-cooled, electrically fired Gatling-style rotary cannon which fires 20 mm rounds at an extremely high rate (typically 6,000 rounds per minute).

The Type 99 Mark 1 cannon and Type 99 Mark 2 cannon were Japanese versions of the Oerlikon FF and Oerlikon FFL.

The Type 97 20-mm antitank rifle is a Japanese semi-automatic anti-tank rifle used before and during the Second World War.

The Solothurn S-18/100 20 mm Anti-Tank Cannon was a Swiss and German anti-tank rifle used during the Second World War.

The Phalanx CIWS is a close-in weapon system for defense against anti-ship missiles.

The NTW-20 is a South African anti-materiel rifle or large-calibre sniper rifle, developed by Denel Mechem in the 1990s.

The MG 151 (MG 151/15) was a 15 mm aircraft-mounted autocannon produced by Waffenfabrik Mauser during World War II.

The Flak 30 (Flugabwehrkanone 30) and improved Flak 38 were 20 mm anti-aircraft guns used by various German forces throughout World War II.

The Oerlikon 20 mm cannon is a series of autocannons, based on an original German 20 mm Becker design that appeared very early in World War I.

The ShVAK (Russian: ШВАК: Шпитальный-Владимиров Авиационный Крупнокалиберный, Shpitalnyi-Vladimirov Aviatsionnyi Krupnokalibernyi, "Shpitalny-Vladimirov large-calibre for aircraft") was a 20 mm autocannon used by the Soviet Union during World War II.

The 2-cm-KwK 30 L/55 (2 cm Kampfwagenkanone 30 L/55) was a German 2 cm cannon used primarily as the chief weapon of the German SdKfz.

The Lahti L-39 is a Finnish 20 mm anti-tank rifle used during the Second World War.

The HS.404 was an autocannon originally designed and produced by Hispano-Suiza.

Ho-1 was a Japanese autocannon used during World War II, it was a Type 97 20 mm anti-tank rifle adapted for use in bomber turrets.

The Polsten was a low cost Polish development of the 20 mm Oerlikon gun.

The 20 mm AA Machine Cannon M/38 was produced by the Danish company Dansk Industri Syndikat (Danish Industry Syndicate) - DISA - in Herlev near Copenhagen and was used by the military of Denmark in different types of mounting.

Type 4 20 mm twin AA machine cannon was a Japanese anti-aircraft gun.

The M39 cannon was a 20 mm caliber single-barreled revolver cannon developed for the United States Air Force in the late 1940s.

20 ItK 40 VKT or 20 mm dual anti-aircraft cannon model 1940 manufactured by VKT was a Finnish light anti-aircraft gun designed by the Finnish gunsmith Aimo Lahti.

The Type 98 20 mm AAG (Anti-Air Gun) Tank was a Japanese self-propelled anti-aircraft gun using twin Soki Type II 20mm anti-air guns.

The Type 98 20 mm AA Half-Track Vehicle was an experimental Japanese self-propelled anti-aircraft gun.

The Colt Mk 12 was a 20 mm cannon widely used by the United States Navy after World War II.

The M197 electric cannon is a three-barreled electric Gatling-type rotary cannon used by the United States military.

The Solothurn ST-5 is a 20 mm anti-aircraft gun designed by Solothurn in Switzerland which ultimately was the design basis for the highly successful 2 cm FlaK 30 series of guns used by Germany in World War II.

The XM301 Cannon is an externally powered, three-barrel 20 mm Gatling gun made by General Dynamics for the U.

The Mauser MG 213 was a 20 mm aircraft-mounted revolver cannon developed for the Luftwaffe during World War II.

The MK 20 Rh 202 (short for MaschinenKanone 20 mm Rheinmetall) is an autocannon with a caliber of 20 mm designed and produced by Rheinmetall.

The Gebirgsflak 38 was a German anti-aircraft weapon of World War II, a lightweight version of the 2 cm FlaK 38 designed for airborne and mountain troops as a dual purpose gun for use against air and ground targets.

The M621 is a 20 mm automatic cannon of French design, developed by Nexter as on-board armament for armored vehicles, aircraft, helicopters and small coastal vessels of the French Navy.

The 20 mm modèle F2 gun is a naval defence weapon used by the French Navy.

The MG FF was a drum-fed, 20 mm aircraft autocannon, developed in 1936 by Ikaria Werke Berlin of Germany.

The Type 98 20 mm AA machine cannon was the most common light anti-aircraft gun of the Imperial Japanese Army.

The Nkm wz.38 FK (Polish military acronym meaning Heaviest Machine Gun Mark 1938) was a 20mm heavy machine gun (autocannon by modern terminology) produced in inter-war Poland.

The Solothurn-Arsenal was an Estonian copy of the Swiss S-18/100 anti-tank rifle.

The Oerlikon SSG36 is an anti tank rifle of Swiss origin.

The Denel Land Systems GI-2 is an autocannon manufactured by Denel Land Systems (DLS) and used by the South African Army, Navy, Air Force, Royal Thai Navy, Indonesian Army and Navy.

Vidhwansak (Sanskrit:"The Destroyer") is an Indian multi-caliber anti-materiel rifle (AMR) or large-caliber sniper rifle manufactured by Ordnance Factory Tiruchirappalli.

The Type 2 20 mm AA machine cannon was a Japanese-designed anti-aircraft gun, based on the German Flak 38.

The 20 mm maskinkanon M.