Kosmos 129 (Russian: Космос 129 meaning Cosmos 129) or Zenit-2 No.33 was a Soviet, first generation, low resolution, optical film-return reconnaissance satellite launched in 1966.

A Zenit-2 spacecraft, Kosmos 129 was the forty-second of eighty-one such satellites to be launched[3][4] and had a mass of 4,730 kilograms (10,430 lb).

[1] Kosmos 129 was launched by a Vostok-2 rocket, serial number U1500-05,[5] flying from Site 41/1 at the Plesetsk Cosmodrome.

[1] Kosmos 129 was operated in a low Earth orbit, at an epoch of 14 October 1966, it had a perigee of 180 kilometres (110 mi), an apogee of 312 kilometres (194 mi), an inclination of 65.0°, and an orbital period of 89.4 minutes.

[2] After seven days in orbit, Kosmos 129 was deorbited, with its return capsule descending under parachute, landing at 06:14 GMT on 21 October 1966, and recovered by Soviet force.