Kosmos 8 (Russian: Космос 8 meaning Cosmos 8), also known as DS-K-8 No.1 and occasionally in the West as Sputnik 18 was a technology demonstration satellite which was launched by the Soviet Union in 1962.

Its primary mission was to demonstrate the technologies of SIGINT for future Soviet military satellites.

[3][4] It also carried a micrometeorite detector payload which discovered meteoroid flux.

[6] The launch was conducted from Mayak-2 at Kapustin Yar, and occurred at 05:02:00 GMT on 18 August 1962.

[7] Kosmos 8 was placed into a low Earth orbit with a perigee of 251 kilometres (156 mi), an apogee of 591 kilometres (367 mi), an inclination of 49.0°, and an orbital period of 92.9 minutes.