Portal:Spaceflight/On This Day/27 May
- 1965 - An Atlas-Agena launches an AFP-206 satellite.
- 1969 - A Kosmos-2I launches the Kosmos 283 satellite.
- 1971 - A Kosmos-2I launches the Kosmos 423 satellite.
- 1974 - A Soyuz launches the Kosmos 656 satellite.
- 1978 - A Proton-K fails to launch an unknown satellite.
- 1986 - A Tsyklon-3 launches a Meteor satellite.
- 1993 - A Proton-K fails to launch a Gorizont satellite.
- 1999 - Space Shuttle Discovery launches on mission STS-96 to the ISS.
- 2006 - An Ariane 5ECA launches the Satmex 6 and Thaicom 5 satellites.
- 2008 - A Long March 4C launches the FY-3A weather satellite.
- 2009 - A Soyuz-FG launches Soyuz TMA-15, with the Expedition 20 crew of the ISS, to establish the first six-man crew on the station.