| 1990-043A | M-1 |
| 1990-043B | M-2 |
| 2011-061D | M-Cubed |
| viz. | MA |
| 1986-061C | MABES |
| 1997-042A | Mabuhay 1 |
| 1990-043A | Macsat 1 |
| 1990-043B | Macsat 2 |
| 2009-037A | MACSAT (Malajsie) |
| 1989-033B | Magellan |
| viz. | Magion |
| 1985-010B | Magnum 1 |
| 1989-090B | Magnum 2 |
| 1979-094A | Magsat [MAGnetic field SATellite] |
| 2009-002E | Maido 1 |
| 1986-017DV | MAK-1 |
| 1986-017GX | MAK-2 |
| 2010-028B | Mango (Prisma) |
| 1966-111A | Manifold |
| 2001-027A | MAP |
| 1998-059A | Maqsat-3 |
| 1997-066B | Maqsat-B |
| 2005-005B | Maqsat-B2 |
| 1997-066A | Maqsat-H |
| 1989-067A | Marcopolo 1 |
| 1990-074A | Marcopolo 2 |
| 1984-114B | Marecs 2 |
| 1981-122A | Marecs A |
| 1984-114B | Marecs B2 |
| 1965-082C | Marents |
| 2002-024A | Marine 1 |
| viz. | Mariner |
| viz. | Marisat |
| 2001-056D | Maroc-Tubsat |
| viz. | Mars |
| 2006-055D | MARSCom |
| 1972-025B | MAS-1 |
| 1975-049B | MAS-2 |
| 2007-012K | MAST |
| 2010-066J | Mayflower |
| 2004-007A | MBSat-1 |
| 1999-050A | MCI-1 |
| 1998-073A | MCO |
| 2002-003A | MDS-1 |
| viz. | Measat |
| 1959-012A | Měčta |
| 2011-058A | Megha-Tropiques (Mēghā-Trŏpiksa) |
| 1999-022B | MegSat-0 |
| 2000-057B | MegSat-1 |
| 2000-004H | MEMS-1 |
| 2000-004H | MEMS-2 |
| viz. | Mentor |
| 2002-052B | MEPSI |
| 2006-055B | MEPSI-2A/2B |
| 2003-032A | MER-1 |
| 2003-027A | MER-2 |
| 2003-027A | MER-A |
| 2003-032A | MER-B |
| viz. | Mercury |
| viz. | Meridian |
| 2004-030A | MESSENGER |
| 1996-062A | Mesur F-1 |
| 1996-068A | Mesur F-2 |
| 1996-068A | Mesur PF |
| 1981-065A | Meteor Priroda |
| viz. | Meteor-1 |
| viz. | Meteor-2 |
| viz. | Meteor-3 a 3M |
| viz. | Meteor-M |
| viz. | Meteosat |
| 2006-044A | MetOp-1 |
| 2006-044A | MetOp-A |
| 2002-043A | MetSat 1 |
| 2001-013A | MGM |
| 1996-062A | MGS |
| 2010-045A | Michibiki |
| 2002-056D | Micro-LabSat |
| 1995-017C | Microlab 1 |
| 1964-074A | Micrometeoroid C |
| viz. | Microsat |
| 2010-045A | Mičibiki |
| viz. | Midas |
| 1999-035A | MIDEX-0 |
| 2000-017A | MIDEX-1 |
| 2001-027A | MIDEX-2 |
| 2004-047A | MIDEX-3 |
| 1996-046A | Midori 1 |
| 2002-056A | Midori 2 |
| 2007-006B | MidSTAR-1 |
| 1998-069C | MightySat 1 |
| 2000-042A | MightySat 2 Sindri |
| 2004-052C | Mikron |
| viz. | Milstar |
| 2009-060A | MIM-2 |
| 2003-031B | MIMOSA |
| 1997-018A | Minisat-01 |
| 1986-017A | Mir |
| 1974-013A | Miranda |
| 2007-012A | MisrSat 1 |
| 2000-039A | MITA-0 |
| 2006-024A | MiTEx-A |
| 2006-024B | MiTEx-B |
| 2006-024C | MiTEx-US |
| 1998-067A | MKS |
| 2000-070A | MKS-1 |
| 2001-010A | MKS-2 |
| 2001-035A | MKS-3 |
| 2000-070A | MKS-EO-1 |
| 2001-010A | MKS-EO-2 |
| 2001-035A | MKS-EO-3 |
| 2010-029A | MKS-EO-24/25 |
| 2010-052A | MKS-EO-25/26 |
| 2011-067A | MKS-EO-29/30 |
| 2011-078A | MKS-EO-30/31 |
| 2001-017A | MKS-2S |
| 2001-048A | MKS-3S |
| 2002-020A | MKS-4S |
| 1999-001A | MLP (Mars Polar Lander) |
| 1996-052B | MO-30 |
| 1967-109B | Module 283 |
| 1966-099A | MOL Canister |
| 1965-024A | Molly Brown |
| viz. | Molnija-1 |
| 1974-060A | Molnija-1S [1] |
| 1983-025A | Molnija-1T 1 |
| 1996-045A | Molnija-1T 23 |
| 1997-054A | Molnija-1T 24 |
| 1998-054A | Molnija-1T 25 |
| 2003-011A | Molnija-1T 26 |
| 2004-005A | Molnija-1T 27 |
| viz. | Molnija-2 |
| viz. | Molnija-3 |
| 1999-036A | Moly 3-50 (Molnija-3 50) |
| 1987-018A | Momo 1A |
| 1990-013A | Momo 1B |
| 2005-032A | Monitor-E 1 |
| 2003-031A | Monitor-E GVM |
| 1989-020B | MOP-1 |
| 1991-015B | MOP-2 |
| 1993-073B | MOP-3 |
| 1985-048B | Morelos 1 |
| 1985-109B | Morelos 2 |
| 1987-018A | MOS-1A |
| 1990-013A | MOS-1B |
| 2003-031D | MOST |
| 1998-068A | Most 1 |
| 2002-054B | Možajec |
| 2003-042D | Možajec 4 |
| 2005-043G | Možajec 5 |
| 1991-031C | MPEC [Multi-Purpose Experiment Canister] |
| 1999-001A | MPL |
| 2000-010A | MPLM F-1 |
| 2000-016A | MPLM F-2 |
| 2001-035A | MPLM F-3 |
| 2001-035A | MPLM Donatello FM-3 |
| 2000-010A | MPLM Leonardo FM-1 |
| 2000-016A | MPLM Raffaello FM-2 |
| viz. | MS |
| 2005-029A | MRO |
| 1996-022A | MSat-1 |
| 1995-019A | MSat-2 |
| 2002-040B | MSG-1 |
| 2005-049B | MSG-2 |
| 2011-070A | MSL |
| 1997-013A | MSL-1 |
| 1997-032A | MSL-1R |
| 1992-078A | MSTI-1 |
| 1994-028A | MSTI-2 |
| 1996-031A | MSTI-3 |
| 2010-061A | MSV-1 |
| 1996-024A | MSX |
| 2011-058A | MT |
| 2000-014A | MTI |
| 1997-049B | MTP-1 |
| 1972-061A | MTS |
| 2005-006A | MTSat-1R |
| 2006-004A | MTSat-2 |
| 1999-026B | MUBLCOM |
| viz. | Mugunghwa |
| 2000-075C | Munin |
| 1996-050A | MUSat |
| 1990-007A | MUSES-A |
| 1997-005A | MUSES-B |
| 2003-019A | MUSES-C |
| 1971-067D | Musketball 1 |
| 1975-075C | Mutch Memorial Station |
| 2000-057A | MY-Sat 1 |
| 1971-067F | Mylar Balloon (LCS-4) |
| 1971-067P | Mylar Sphere |
| 1994-007B | Myojo |