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|Mission name||Soyuz TM-21|
|Spacecraft mass||7170 kg|
|Crew size||3 launched / 2 landed|
|Call sign||Урага́н (Uragan - Hurricane)|
|Launch date||March 14, 1995
|Landing||September 11, 1995
108 km NE of Arkalyk
|Mission duration||181 days 00 hours 41 minutes 06 seconds|
|Number of orbits||~2,940|
|Orbital period||88.7 minutes|
|From left to right: Norman Thagard, Vladimir Dezhurov, Gennady Strekalov|
Soyuz TM-21 was Soyuz mission, a human spaceflight mission transporting personnel to the Russian space station Mir. Part of the US/Russian Shuttle-Mir Program, the mission launched from Baikonur Cosmodrome, atop a Soyuz-U2 carrier rocket, at 06:11:34 UTC on March 14, 1995. It is of note because its launch marked the presence, for the first time ever, of thirteen humans in space simultaneously - three aboard the Soyuz, three aboard Mir and seven aboard Space Shuttle Endeavour, flying STS-67.
The spacecraft carried expedition EO-18 to the space station, including the first American astronaut to launch on a Soyuz spacecraft and board Mir, Norman Thagard, for the American Thagard Increment aboard the station, the first Increment of the Shuttle-Mir program. The three crew members it launched were relieved by Space Shuttle Atlantis during STS-71, when they were replaced by expedition EO-19, who returned to earth aboard Soyuz TM-21 on September 11, 1995.
|Position||Launching crew||Landing crew|
|Commander|| Vladimir Dezhurov
| Anatoly Solovyev
|Flight Engineer|| Gennady Strekalov
| Nikolai Budarin
|Research Cosmonaut|| Norman Thagard
Mission parameters 
- Mass: 7150 kg
- Perigee: 201 km
- Apogee: 247 km
- Inclination: 51.65°
- Period: 88.7 minutes
- First Mir docking: March 16, 1995, 07:45:26 UTC
- First Mir undocking: July 4, 1995, 10:55 UTC
- Second Mir docking: July 4, 1995, 11:39 UTC
- Second Mir undocking: September 11, 1995, 03:30:44 UTC
- "Spaceflight mission report: Soyuz TM-21". Spacefacts.de. February 19, 2007. Retrieved 2007-04-09.
- "Soyuz TM-21". Encyclopaedia Astronautica. March 12, 2001. Retrieved 2007-04-09.