Medium Mark III

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Medium Mk III
Type	Medium tank
Place of origin	United Kingdom
Service history
Used by	British Army
Production history
Designed	1930 (A6 – 1926)
Manufacturer	Vickers-Armstrong Royal Ordnance Factory
No. built	3
Specifications
Mass	16 tons
Length	21 ft 6 in (6.55 m)
Width	8 ft 9 in (2.67 m)
Height	9 ft 2 in (2.79 m)
Crew	7
Armour	9-14 mm
Main armament	3 pounder gun
Secondary armament	3 × 0.303 (7.7 mm) Vickers machine guns
Engine	Armstrong Siddeley air-cooled V8 180 hp (130 kW)
Operational range	120 miles (190 km)
Maximum speed	30 mph (48 km/h)

The Medium Mark III was a medium tank developed by the United Kingdom during the Interwar period.

The prototypes of the Medium Mark II were the three A6 also known as "16-tonner" tanks. From the tests of the A6, three Mark IIIs were built and put into service with the British Army but due to the high cost no more were purchased.