Kosmos 13 (Russian: Космос 13 meaning Cosmos 13) or Zenit-2 No.9 was a Soviet optical film-return reconnaissance satellite launched in 1963. A Zenit-2 spacecraft, Kosmos 13 was the eighth of eighty-one such satellites to be launched and had a mass of 4,730.0 kilograms (10,427.9 lb).
Kosmos 13 was operated in a low Earth orbit. On 23 March 1963 it had a perigee of 201 kilometres (125 mi), an apogee of 317 kilometres (197 mi), with inclination of 64.9 degrees and an orbital period of 89.69 minutes. After eight days in orbit, the spacecraft was deorbited on 29 March 1963, with its return capsule descending by parachute for recovery. In addition to its reconnaissance payload, Kosmos 13 also carried an experiment to measure radiation levels in its environment.
Payloads are separated by bullets ( · ), launches by pipes ( | ). Manned flights are indicated in bold text. Uncatalogued launch failures are listed in italics. Payloads deployed from other spacecraft are denoted in brackets.