Portal:Spaceflight/On This Day/23 April
- 1962 - An Atlas-Agena launches the Ranger 4 probe.
- 1964 - An Atlas-Agena launches an AFP-206 satellite.
- 1965 - A Molniya rocket launches a Molniya-1 satellite.
- 1967 - A Soyuz rocket launches the manned Soyuz 1 mission.
- 1969 - A Voskhod rocket launches the Kosmos 280 satellite.
- 1970 - A Delta M launches the Intelsat III F-7 satellite.
- 1970 - A Kosmos-2I launches the Kosmos 334 satellite.
- 1971 - A Kosmos-3M launches the Kosmos 407 satellite.
- 1974 - A Kosmos-3M launches six Strela satellites.
- 1982 - A Soyuz-U launches the Kosmos 1353 satellite.
- 1983 - A Tsyklon-3 launches the Kosmos 1455 satellite.
- 1986 - A Soyuz-U2 launches the Progress 26 spacecraft to resupply Mir.
- 1994 - A Zenit-2 launches the Kosmos 2278 satellite.
- 1996 - A Proton-K launches the Priroda module of Mir.
- 2007 - A PSLV launches the AGILE satellite.
- 2012 - A Proton-M launches the Yahsat 1B satellite.