List of prototype World War II combat vehicles explained

This list contains combat vehicles which never left the design phase or had an extremely limited production (usually < 10).

Australia

Entwicklung Series Entwicklung series, a comprehensive redesign of German armor from small tracked vehicles to a 100-ton super-heavy tank. Only a single E-100 chassis was completed
Leichttraktor, pre-war light tank, four built
Neubaufahrzeug, pre-war heavy tank design, five built
Panther II, development of the Panzerkampfwagen V "Panther". A single chassis was built
Panzerkampfwagen VII "Löwe", a super-heavy tank project that never reached prototype stage
Panzerkampfwagen VIII "Maus", a super-heavy tank. Two prototypes built
Panzerkampfwagen IX & Panzerkampfwagen X Paper project
Landkreuzer P. 1000 Ratte; paper project
Landkreuzer P. 1500 Monster; paper project
12.8 cm Selbstfahrlafette auf VK 30.01(H) "Sturer Emil" - tank destroyer; 2 built
Heuschrecke 10, Krupp's design for a new self-propelled artillery gun
VK 3001 (P) - medium tank; paper project
VK 3002(DB) - prototype medium tank; one built
VK 4501 (P) - Porsche Tiger tank; 100 hulls built, 90 converted to Ferdinands, one Tiger (P) built, 3 Bergepanzer Tiger (p) and 3 Rammtigers built.
Dicker Max, two prototypes built
VK 20, medium tank proposed to replace the Panzer III and Panzer IV; paper project
Panzer-Selbstfahrlafette II, half-track tank destroyer; two built
Panzer-Selbstfahrlafette IV Ausf. C, SPG, 3 built
Geschützwagen Tiger, self-propelled artillery gun; one partial prototype built
VK 1602 Leopard, reconnaissance tank; paper project

Type 95 heavy tank; 4 built in 1934
Hi-Ro Sha 10 cm cannon self-propelled gun on Type 95 heavy tank chassis
Ji-Ro Type 92 10 cm cannon self-propelled gun on Type 95 heavy tank chassis
Type 97 Chi-Ni medium tank; one prototype built
Type 98 Chi-Ho medium tank; 4 built, two in 1940 and two in 1941
O-I super-heavy tank design in the 120-ton range. Exact stage of development unknown
Type 97 Ki-To SPAAG self-propelled anti-aircraft gun on Type 97 Te-Ke tankette chassis; one prototype built
Type 98 Ta-Se single 20 mm self-propelled anti-aircraft gun on a Type 98 Ke-Ni chassis
Type 98 20 mm AAG tank twin 20 mm self-propelled anti-aircraft gun on a Type 98 Ke-Ni chassis
ATG Carrier So-To; light armored transport with an AT Gun in Type 97 Te-Ke tankette structure
Type 3 Ke-Ri light tank; a few prototypes were produced
Type 2 Ku-Se 75 mm self-propelled gun on a Type 1 Chi-He chassis
Type 4 Chi-To medium tank; two completed and four chassis manufactured
Type 5 Chi-Ri medium tank; one incomplete prototype built
Type 5 Ke-Ho light tank; one prototype built
Type 4 Ho-To 12 cm self-propelled gun on a modified Type 95 Ha-Go chassis
Type 5 Ho-Ru 47 mm self-propelled gun; a light tank destroyer akin to the German Hetzer; one prototype built
Type 5 Na-To tank destroyer; two built
Type 5 To-Ku amphibious tank
Type 5 Ho-Ri tank destroyer with a 105 mm cannon and an additional 37 mm gun; exact status unknown
Naval 12 cm SPG; one prototype built with a mounted Type 10 120 mm gun on a Type 97 Chi-Ha chassis

Ka-To 105 mm SP AT gun was a combination of the Type 5 Na-To open top superstructure and the extended hull of the Type 4 Chi-To. Exact stage of development unknown
Type 5 15 cm SPG Ho-Chi; similar to Type 1 Ho-Ni I and Type 4 Ho-Ro SPGs, with a Type 96 15 cm (149.1 mm) howitzer mounted on a Type 97 chassis. Stage of development unknown
Type 97 Experimental flamethrower tank; incomplete prototypes. The first version replaced the hull machine gun with a flamethrower. The second version was fitted with two large, elongated fuel tanks and two flamethrowers on each side of the chassis. It utilized an electric flame igniter system.