Kosmos 321 (Russian: Космос 321 meaning Cosmos 321), also known as DS-U2-MG No.1, was a Soviet satellite which was launched in 1970 as part of the Dnepropetrovsk Sputnik programme.

It was a 365-kilogram (805 lb) spacecraft,[1] which was built by the Yuzhnoye Design Bureau, and was used to investigate the magnetic poles of the Earth.

[1] A Kosmos-2I 63SM carrier rocket was used to launch Kosmos 321 into low Earth orbit.

[2] The launch occurred at 20:19:59 UTC on 20 January 1970, and resulted in the successful insertion of the satellite into orbit.

[4] The North American Aerospace Defense Command assigned it the catalogue number 04308.