| 1991-063B | UARS |
| viz. | UFO |
| 2009-049D | UgatuSat |
| viz. | UHF |
| 1970-107A | Uhuru |
| viz. | UK |
| 1984-088C | UKS |
| 1990-090B | Ulysses |
| 1976-019A | Ume 1 |
| 1978-018A | Ume 2 |
| 1996-052B | Unamsat-B |
| 1999-026A | UNEX |
| 2003-002B | UNEX-1 |
| 2000-057C | Unisat 1 |
| 2002-058D | Unisat 2 |
| 2004-025H | Unisat 3 |
| 2010-020F | UNITEC-1 |
| část 1998-067A | Unity (modul) |
| 1998-069A | Unity (vzlet) |
| 2005-002C | Universitetskij |
| 2009-049E | Universitetskij 2 |
| 2005-002C | Universitetskij-Tat'jana |
| 2009-049E | Universitetskij-Tat'jana 2 |
| 1998-069F | Unity (samostatný objekt) |
| viz. | Uosat |
| 1999-021A | UoSAT-12 |
| 1995-033C | UPM/LBSat-1 |
| 1995-033C | UPM/Sat-1 |
| viz. Glonass | Uragan |
| viz. | Uribyol |
| viz. | USA |
| 2002-042A | USERS |
| 2002-042H | USERS SEM |
| 1992-034A | USML-1 |
| 1995-056A | USML-2 |
| viz. | USMP |
| 2005-043C | UWE-1 |
| 2009-052D | UWE-2 |