Kosmos 166 (Russian: Космос 166 meaning Cosmos 166), also known as DS-U3-S No.1, was a satellite which was launched by the Soviet Union in 1967 as part of the Dnepropetrovsk Sputnik programme.

It was a 400 kilograms (880 lb) spacecraft,[1] which was built by the Yuzhnoye Design Office, and was used to conduct multispectral imaging of the Sun.

[3] Kosmos 166 was launched from Site 86/1 at Kapustin Yar, aboard a Kosmos-2I 63SM carrier rocket.

[4] The launch occurred at 04:44:00 GMT on 16 June 1967, and resulted in the successful insertion of the satellite into a low Earth orbit.

[1] The North American Air Defense Command assigned it the catalogue number 02848.