Kosmos 850 (Russian: Космос 850 meaning Cosmos 850), also known as DS-P1-Yu No.79, was a Soviet satellite which was launched in 1976 as part of the Dnepropetrovsk Sputnik programme.

It was a 400-kilogram (880 lb) spacecraft, which was built by the Yuzhnoye Design Bureau, and was used as a radar calibration target for anti-ballistic missile tests.

[1] A Kosmos-2I 63SM carrier rocket was used to launch Kosmos 850 from Site 133/1 of the Plesetsk Cosmodrome.

[2] The launch occurred at 11:00 UTC on 26 August 1976, and resulted in the successfully insertion of the satellite into low Earth orbit.

[4] The North American Aerospace Defense Command assigned it the catalogue number 09387.