The BMD-20 (GRAU designation 8U33) was a 200 mm multiple rocket launcher (MRL) created by the Soviet Union.

Following the success of rocket artillery systems like the Katyusha during World War II, the Soviet Union continued development on such weapons.

The system was based on a ZIS-151 6×6 truck chassis carrying four rockets in an open steel lattice resting at +9° elevation which could be raised to +60° and traverse 20° to the sides.

Although powerful, the rockets were not accurate, dispersing 90-210 meters from each other, so multiple launchers were intended to be used at once to bombard a large area.

[1][2][3] The BMD-20 entered service with the Soviet Union in 1952 and remained in production to the end of the decade with 4,000 systems produced.