SOYUZ-TMA 21
| Launched | 3 April 2011 |
| Flight ended | 15 September 2011 |
| Status | Decayed |
| Destination | Earth Landing |
| Launch site | Tyuratam Missile and Space Center, Kazakhstan (Also known as Baikonur Cosmodrome) |
| Owner | Commonwealth of Independent States (former USSR) |
| NORAD ID | 37382 |
| COSPAR ID | 2011-012A |
| Observing |
Launched alongside
SL-4 R/B