| 2000-004J | JAK |
| viz. | Jamal |
| viz. | Jao-kan |
| viz. | Jao-kan Wej-sing |
| 1986-061B | JAS-1 |
| 1990-013C | JAS-1B |
| 1996-046B | JAS-2 |
| 2001-055A | Jason 1 |
| 2008-032A | Jason 2 |
| 2000-004A | JAWSAT |
| viz. | JB |
| 2000-050A | JB-3 1 |
| 2002-049A | JB-3 2 |
| viz. | JCSat |
| 1984-012C | JD-1 |
| 1984-012D | JD-2 |
| 1984-012F | JD-3 |
| 1992-007A | JERS-1 |
| 2002-012B | Jerry |
| viz. | Jianbing |
| 1993-063A | Jianbing 93 |
| 1978-087A | Jiki'ken |
| 1978-087A | Jikiken |
| 1986-061A | Jindai |
| 2004-029A | Ji Qu Xing |
| 1976-019A | JISS |
| 2004-029A | Ji Xing |
| 1996-046B | JO-29 |
| 2011-007A | Johannes Kepler (ATV-2) |
| 1975-070A | JSSW-1 |
| 1975-119A | JSSW-2 |
| 1976-087A | JSSW-3 |
| 2008-025A | Jubilejnyj |
| 2011-058B | Jugnu (Juganū) |
| 2008-008A | Jules Verne (ATV-1) |
| viz. | Jumpseat |
| 2011-040A | Juno (New Frontiers Mission 2) |
| 1991-034A | Juno (Sojuz-TM 12) |
| 2011-015B | JutSat |