Trial and research tanks

Little Willie was a prototype in the development of the British Mark I tank.

Object 775 (Объект 775) was a Soviet experimental missile tank built in 1964.

O-I was the name given to a proposed series of Japanese super-heavy tanks, to be used in the Pacific Theater.

The Tank, Heavy, TOG II* was a prototype British tank design produced in the early part of the Second World War in case the battlefields of northern France devolved into a morass of mud, trenches and craters as had happened during the First World War.

The Tsar Tank (Russian: Царь-танк), also known as the Netopyr' (Нетопырь) which stands for Pipistrellus (a genus of bat) or Lebedenko Tank (танк Лебеденко), was an unusual Russian armoured vehicle developed by Nikolai Lebedenko (Николай Лебеденко), Nikolai Zhukovsky (Николай Жуковский), Boris Stechkin (Борис Стечкин), and Alexander Mikulin (Александр Микулин) from 1914 onwards.

Stridsvagn L-120 (English: Battletank L[andsverk]-120) was a light tank designed in Sweden.

The Steam Tank (Tracked) was an early U.

Object 279 Kotin (Объект 279 Котин) was a Soviet experimental heavy tank developed at the end of 1959.

The T28 Super Heavy Tank was an American heavily armored tank self-propelled gun designed for the United States Army during World War II.

The Tank, Heavy Assault, Tortoise (A39) was a British heavy assault tank design developed in World War II but never put into mass production.

The "Armata" Universal Combat Platform (Russian: Армата) is a Russian prototype of an advanced next generation heavy military tracked vehicle platform.

The Black Eagle tank (Russian: Чёрный Орёл, Čërnyj Orël, or Object 640), was a presumed prototype main battle tank produced in the Russian Federation.

The ELC project was a prototype light tank project launched by the French Ministry of Defense in 1955.

Grosstraktor ("large tractor") was the name given to six prototype medium tanks built (two each) by Rheinmetall, Krupp and Daimler, for the German Weimar Republic, in violation of the Treaty of Versailles.

The KV-13 was an experimental Soviet medium tank created during World War II.

The MBT-70 (German: KPz 70) was a 1960s German-U.

Object 187 (Объект 187) was a Soviet experimental main battle tank developed between the late 1980s and middle 1990s.

The Versuchsträger 1-2 (abbreviated: VT, meaning "test-beds" or "experiment carrier") were two German prototype twin gun turretless main battle tanks, much like the earlier World War II Jagdpanzer designs.

The Großkampfwagen or "K-Wagen" (short for G.K.-Wagen) was a German super-heavy tank, two prototypes of which were almost completed by the end of World War I.

The Leichter Kampfwagen (English: light combat car) or "LK I" was a German light tank prototype of the First World War.

The T-23 was a prototype tankette developed by the Soviet Union during the interwar period.

Object 478 (Russian: Объект 478) was a Soviet main battle tank prototype.

Panzerkampfwagen VIII Maus ("Mouse") was a German World War II super-heavy tank completed in late 1944.

The Assault Tank T14 was a joint project between the United States and the United Kingdom.

The Altay is a modern main battle tank, designed and developed by Otokar, a subsidiary of Koç Holding, for the Turkish Army and export markets.

The 10TP was a Polish light cruiser tank that never left the prototype status.

Batignolles-Chatillon Char 25T was a French tank developed by Batignolles-Chatillon in the 1950s.

Object 292 (Объект 292) was a Soviet experimental tank built in September 1990.

Object 785 (Объект 785) was a Soviet experimental main battle tank built in the late 1970s.

The Skeleton Tank was an experimental prototype tank built in 1918 by the Pioneer Tractor Company, Winona, Minnesota.

The Heavy Tank T29 and Heavy Tank T34 were an American heavy tank project started in March 1944 to counter the new German heavy tanks.

The Heavy Tank T30 was a World War II American tank project developed to counter new German tanks, such as Tiger I, Tiger II, and the Jagdtiger or Soviet heavy tanks, such as IS-1 or IS-2.

The Independent A1E1 is a multi-turreted tank that was designed by the British armaments manufacturer Vickers between the First and Second World Wars.

The WZ-111 heavy tank (Chinese: WZ-111重型坦克) was a heavy tank that was developed by the People's Republic of China (PRC) throughout the 1960s but was eventually cancelled in 1966 due to many mechanical problems stuck with the design.

The 44M Tas was a Hungarian medium/heavy tank design of World War II.

The Holt Gas-Electric Tank was the first prototype tank built in the United States in a collaboration between the Holt Manufacturing Company (now Caterpillar Inc.) and the General Electric Company.

Hovercraft tank, or, officially, the amphibious hovering tank (Russian: Земноводный подлетающий танк) was developed at Moscow aircraft plant #84 in the USSR in 1937 by a group of engineers led by professor Vladimir Israilevich Levkov.

The Frot-Laffly landship, also Frot-Turmel-Laffly landship (French: Char Frot-Turmel-Laffly, also Rouleau cuirassé Paul Frot), was an early French experimental armoured fighting vehicle, or landship, designed and built from December 1914 to March 1915, preceding the design and development of the English Little Willie tank by about nine months.

The Souain experiment was a French military experiment using a Baby Holt Caterpillar, in the former battlefield of Souain, in northeastern France, on 9 December 1915.

The Steam Wheel Tank was an early U.

The Chrysler TV-8 was an experimental concept tank designed by Chrysler in the 1950s.

Cultivator No. 6 was the code name of a military trench-digging machine developed by the British Royal Navy at the beginning of World War II.

The Breton-Prétot machine was an experimental wire-cutting device developed in France from November 1914.

The Boirault machine (French: Appareil Boirault), was an early French experimental landship, designed in 1914 and built in early 1915.