The T25 Medium Tank was a prototype tank that was produced by the United States during World War II. The vehicle had an armament consisting of a 90mm antitank gun, two .30 MGs, one mounted coaxially and one in the bow, and a .50 Browning M2 mount on top of the turret. The vehicle had a crew of five, a weight of 35,100kg, used the same 474hp, GAN V8 engine as the earlier T23, and had a top speed of 48km/h.
It also used a modified T23 Medium Tank hull, and had a new turret mounting a heavy 90mm antitank gun, the same later used in the M36 Motor Gun Carriage and the tank's predecessor, the M26 Heavy Tank. The length of the T25 Prototype was about 7 meters and the armor protection was about 88mm thick. The T25 utilizes a 3 speed forward, 1 speed reverse transmission system and about forty-two rounds of 90mm ammunition could be stored onboard.
The T25 was later developed into the T25E1, which had the torsion bar suspension later adopted for use in the M26. Only 40 T25 and T25E1 prototypes were built.
The T25 was originally supposed to compliment the heavier T26, which was also in development at that time. The T26 was identical to the T25, except for thicker armor. Eventually, the Army Ground forces rejected the 90mm gun design, and opted for a 76mm antitank gun in the same large turret, as the 90mm encouraged the stalking of, and direct conflict with enemy tanks, a role saved for the tank destroyers. Not long after, the project was cancelled. However, the T26 did not meet the same fate. And after a struggle between the office of ordnance and the Army Ground Forces, the T26E3 was standardized as the M26 heavy tank.