Kosmos 775 (Russian: Космос 775 meaning Cosmos 775) is a Soviet US-KS missile early warning satellite which was launched in 1975 as part of the Oko programme.

The satellite is designed to identify missile launches using optical telescopes and infrared sensors.

[1] A Proton-K carrier rocket with a DM upper stage was used to perform the launch, which took place at 00:30 UTC on 8 October 1975.

[2] The United States Space Command assigned it the Satellite Catalog Number 8357.

Podvig says its orbit was never stabilised,[3] NASA's National Space Science Data Centre says it exploded.