Portal:Spaceflight/On This Day/15 January
- 1965 - A Thor-Agena launches a KH-4A spy satellite.
- 1969 - Soyuz 5 launches on a mission to rendezvous and dock with Soyuz 4
- 1970 - A Delta M launches Intelsat 3-F6.
- 1970 - A Kosmos-2I launches a DS-P1-Yu experimental target satellite.
- 1976 - A Titan IIIE launches the Helios 2 spacecraft to investigate the Sun.
- 1985 - A Tsyklon-3 launches two Strela comsats, and four boilerplate mockups.
- 1986 - A Soyuz-U launches a Yantar-4K1 spy satellite.
- 1986 - A Soyuz-U launches a Zenit-8 spy satellite.
- 1988 - A Tsyklon-3 launches six Strela comsats.
- 1991 - An Ariane 4 launches the Italsat 1 and Eutelsat II F2 comsats
- 1995 - An Mu-3S-II rocket fails to launch the Express 1 satellite.
- 1996 - The crew of STS-72 perform an EVA to test techniques for ISS assembly
- 2003 - The crew of the ISS perform an EVA to deploy a radiator panel.
- 2004 - The Spirit rover begins its exploration of Mars
- 2006 - Samples taken by the Stardust spacecraft return to Earth.
- 2008 - A Sea Launch Zenit-3SL launches Thuraya 3.
- 2013 - A Rokot / Briz-KM rocket launches three Strela-3M military communication satellites.