The SU-100P (Russian: СУ-100П, GABTU index "Object 105") is a Soviet experimental 100-mm self-propelled howitzer, and is designed by OKB-3 of the heavy machine construction division of Uralmash.

After the Second World War in 1945, the USSR started to make plans for a new anti-tank and assault gun to defeat enemy armored vehicles with direct fire.

At that time, Europe and the United States were developing artillery that are able to fire from closed positions.

Utilizing experience gained during the Eastern Front, OKB-3 under L. I. Gorlitsky prepared two projects for the new artillery.

The prototype had a number of problems, unreliability of the lifting mechanism and insufficient stability of self-propelled guns when firing.

Improvements of the chassis and elimination of identified flaws continued until June 1955, after which the SU-100P and the SU-152G were accepted into service by the Soviet Army.

The middle of the vehicle was the combat compartment, and a box-shaped turret houses the gun.