Portal:Spaceflight/On This Day/20 May

• 1965 - A Thor-Burner launches the OPS 8386 satellite.
• 1969 - A Voskhod launches the Kosmos 282 satellite.
• 1970 - A Voskhod launches the Kosmos 345 satellite.
• 1970 - A Thorad-Agena launches a CORONA satellite.
• 1972 - A Titan 24B fails to launch a KH-8 satellite.
• 1975 - A Titan IIIC launches two DSCS satellites.
• 1976 - A Voskhod launches the Kosmos 819 satellite.
• 1978 - An Atlas-Centaur launches the Pioneer Venus Orbiter.
• 1980 - A Kosmos-3M launches the Kosmos 1181 satellite.
• 1982 - A Molniya-M launches the Kosmos 1367 satellite.
• 1992 - An ASLV launches the SROSS-C satellite.
• 1994 - A Proton-K launches a Gorizont satellite.
• 1995 - A Proton-K launches the Spektr module of Mir.
• 1997 - A Delta II launches the Thor 2 satellite.
• 1997 - A Zenit-2 fails to launch an unknown satellite.
• 1999 - A Proton-K launches a Nimiq satellite.
• 2001 - The Soyuz-FG makes its maiden flight, launching the Progress M1-6 spacecraft to resupply the International Space Station.
• 2004 - A Taurus launches the ROCSAT-2 satellite.
• 2005 - A Delta II launches the NOAA 18 satellite.
• 2010 - An H-IIA launches the Akatsuki Venus orbiter and 5 cubesats.
• 2011 - A Proton-M launches the Telstar 14R satellite.
• 2011 - An Ariane 5ECA launches the ST-2 and GSAT-8 satellites.