 IBSS-SPAS | April 28, 1991 | Ballistic Missile Defense Organization | Space Shuttle |
 IceCube | April 18, 2017 | National Aeronautics and Space Administration | Atlas V 401 |
 ICESat | January 13, 2003 | National Aeronautics and Space Administration | Delta II |
 ICESat-2 | September 15, 2018 | Northrop Grumman Corporation | Delta II |
| ICEYE X1 | January 12, 2018 | ICEYE | Polar Satellite Launch Vehicle-XL |
| ICO G1 | April 14, 2008 | — | Atlas V 421 |
| ICOR-SV | March 12, 2026 | Lockheed Martin Space | Firefly Alpha |
| ICube-1 | November 21, 2013 | Institute of Space Technology | Dnepr |
 ICUBE-Q | May 3, 2024 | Institute of Space Technology | Long March 5 |
| IDCSP 1-1 | June 16, 1966 | — | Titan IIIC |
| IDCSP 1-2 | June 16, 1966 | — | Titan IIIC |
| IDCSP 1-3 | June 16, 1966 | — | Titan IIIC |
| IDCSP 1-4 | June 16, 1966 | — | Titan IIIC |
| IDCSP 1-5 | June 16, 1966 | — | Titan IIIC |
| IDCSP 1-6 | June 16, 1966 | — | Titan IIIC |
| IDCSP 1-7 | June 16, 1966 | — | Titan IIIC |
| IDEASSat | January 24, 2021 | — | Falcon 9 |
 Idefix | October 19, 2026 | Microgravity User Support Center, Toulouse Space Centre | H3 Launch Vehicle |
| IDEFIX CU1 | May 4, 2002 | — | Ariane 42P |
| IDEFIX CU2 | May 4, 2002 | — | Ariane 42P |
| IGS Optical 5 Demo | January 27, 2013 | Cabinet Satellite Information Center | H-IIA |
| IGS Radar 4 | January 27, 2013 | Cabinet Satellite Information Center | H-IIA |
 IKAROS | May 20, 2010 | Japan Aerospace Exploration Agency | H-IIA |
| Ikonos | September 24, 1999 | DigitalGlobe | Athena II |
 IMAGE | March 25, 2000 | Goddard Space Flight Center, Southwest Research Institute | Delta II |
 Imaging X-ray Polarimetry Explorer | December 9, 2021 | Marshall Space Flight Center, Laboratory for Atmospheric and Space Physics | Falcon 9 Block 5 |
| IMS-1 | April 28, 2008 | Indian Space Research Organisation | Polar Satellite Launch Vehicle |
| IndoStar-1 | November 12, 1997 | — | Ariane 44L |
 Inflatable Antenna Experiment | May 19, 1996 | — | Space Shuttle |
 InflateSail | June 23, 2017 | — | Polar Satellite Launch Vehicle-XL |
| Informator-1 | January 29, 1991 | — | Kosmos-3M |
 Infrared Space Observatory | November 17, 1995 | European Space Operations Centre | Ariane 44P |
 Ingenuity | July 30, 2020 | Jet Propulsion Laboratory | Atlas V 541 |
 Injun 1 | June 29, 1961 | University of Iowa | Thor-Ablestar |
| Injun 2 | January 24, 1962 | University of Iowa | Thor-Ablestar |
 Injun 3 | December 13, 1962 | — | Thor-Agena D |
 Injun 4 | November 21, 1964 | National Aeronautics and Space Administration | Scout X-4 |
| Injun 5 | August 8, 1968 | National Aeronautics and Space Administration | Scout B |
 Injun 6 | June 3, 1974 | National Aeronautics and Space Administration | Scout E-1 |
| Inmarsat 2-F1 | October 30, 1990 | — | Delta II |
| Inmarsat 2-F2 | March 8, 1991 | — | Delta II |
| Inmarsat 2-F3 | December 16, 1991 | — | Ariane 44L |
| Inmarsat 2-F4 | April 15, 1992 | — | Ariane 44L |
| Inmarsat 3-F2 | September 6, 1996 | — | Proton-K |
| Inmarsat 3-F3 | December 18, 1996 | — | Atlas II |
| Inmarsat 3-F5 | February 4, 1998 | — | Ariane 44LP |
| Inmarsat 4-F2 | November 8, 2005 | — | Zenit-3SL |
| Inmarsat-3 F1 | April 3, 1996 | — | Atlas II |
| Inmarsat-3 F4 | June 3, 1997 | Inmarsat | Ariane 44L |
| Inmarsat-4 F1 | March 11, 2005 | — | Atlas V 431 |
| Inmarsat-4 F3 | August 18, 2008 | Inmarsat | Proton-M |
 Inmarsat-4A F4 | July 25, 2013 | Inmarsat, European Space Agency | Ariane 5 ECA |
| Inmarsat-5 F1 | December 8, 2013 | — | Proton-M |
| Inmarsat-5 F2 | February 1, 2015 | — | Proton-M |
| Inmarsat-5 F3 | August 28, 2015 | — | Proton-M |
| Inmarsat-5 F4 | May 15, 2017 | Inmarsat | Falcon 9 Full Thrust |
| Inmarsat-5 F5 | November 26, 2019 | Inmarsat | Ariane 5 ECA |
| Inmarsat-6 F1 | December 22, 2021 | Inmarsat | H-IIA |
| Inmarsat-6 F2 | February 18, 2023 | Inmarsat | Falcon 9 Block 5 |
| INSAT-1A | April 10, 1982 | Indian Space Research Organisation | Delta 3000 |
 INSAT-1B | August 30, 1983 | Indian Space Research Organisation | Space Shuttle |
| INSAT-1C | July 21, 1988 | Indian Space Research Organisation | Ariane 3 |
| INSAT-1D | June 12, 1990 | Indian Space Research Organisation | Delta 4000 |
| INSAT-2A | July 9, 1992 | Indian Space Research Organisation | Ariane 44L |
| INSAT-2B | July 22, 1993 | Indian Space Research Organisation | Ariane 44L |
| INSAT-2C | December 6, 1995 | Indian Space Research Organisation | Ariane 44L |
| INSAT-2D | June 3, 1997 | Indian Space Research Organisation | Ariane 44L |
| INSAT-2DT | February 26, 1992 | Indian Space Research Organisation, Arab Satellite Communications Organization | Ariane 44L |
| INSAT-2E | April 2, 1999 | Indian Space Research Organisation | Ariane 42P |
 INSAT-3A | April 9, 2003 | Indian Space Research Organisation | Ariane 5G |
| INSAT-3B | March 21, 2000 | Indian Space Research Organisation | Ariane 5G |
 INSAT-3C | January 23, 2002 | Indian Space Research Organisation | Ariane 42L |
| INSAT-3D | July 25, 2013 | Indian Space Research Organisation | Ariane 5 ECA |
 INSAT-3DR | September 8, 2016 | Indian Space Research Organisation | Geosynchronous Satellite Launch Vehicle Mark II |
 INSAT-3DS | February 17, 2024 | — | Geosynchronous Satellite Launch Vehicle Mark II |
 INSAT-3E | September 27, 2003 | Indian Space Research Organisation | Ariane 5G |
 INSAT-4A | December 21, 2005 | Indian Space Research Organisation | Ariane 5GS |
| INSAT-4B | March 11, 2007 | Indian Space Research Organisation | Ariane 5 ECA |
| INSAT-4C | July 10, 2006 | Indian Space Research Organisation | Geosynchronous Satellite Launch Vehicle Mark I |
| INSAT-4CR | September 2, 2007 | Indian Space Research Organisation | Geosynchronous Satellite Launch Vehicle Mark I |
| INSAT-4E | August 27, 2015 | Indian Space Research Organisation | Geosynchronous Satellite Launch Vehicle Mark II |
 InSight | May 5, 2018 | Jet Propulsion Laboratory, National Aeronautics and Space Administration | Atlas V 401 |
| Inspektor | October 5, 1997 | — | Soyuz-U |
 INSPIRE-Sat 7 | April 15, 2023 | — | Falcon 9 |
 Intasat | November 15, 1974 | — | Delta 2000 |
 INTEGRAL | October 17, 2002 | Roscosmos State Corporation, European Space Agency, National Aeronautics and Space Administration | Proton-K |
 Integrity | April 1, 2026 | National Aeronautics and Space Administration | Space Launch System Block 1 |
| Intelsat 10 | May 15, 2001 | — | Proton-K |
| Intelsat 10-02 | June 16, 2004 | — | Proton-M |
| Intelsat 11 | October 5, 2007 | Intelsat | Ariane 5GS |
| Intelsat 12 | October 29, 2000 | — | Ariane 44LP |
| Intelsat 14 | November 23, 2009 | Intelsat | Atlas V 431 |
| Intelsat 15 | November 30, 2009 | Intelsat | Zenit-3SLB |
| Intelsat 16 | February 12, 2010 | Intelsat | Proton-M |
| Intelsat 17 | November 26, 2010 | — | Ariane 5 ECA |
| Intelsat 18 | October 5, 2011 | — | Zenit-3SLB |
| Intelsat 19 | June 1, 2012 | Intelsat | Zenit-3SL |
| Intelsat 1R | November 16, 2000 | PanAmSat | Ariane 5G |
| Intelsat 2 | July 8, 1994 | PanAmSat | Ariane 44L |
| Intelsat 20 | August 2, 2012 | Intelsat | Ariane 5 ECA |
| Intelsat 21 | August 19, 2012 | Intelsat | Zenit-3SL |
| Intelsat 22 | March 25, 2012 | Intelsat | Proton-M |
| Intelsat 23 | October 14, 2012 | Intelsat | Proton-M |
| Intelsat 24 | May 16, 1996 | Intelsat | Ariane 44L |
| Intelsat 25 | July 7, 2008 | — | Ariane 5 ECA |
| Intelsat 26 | February 17, 1997 | — | Atlas II |
 Intelsat 27 | February 1, 2013 | Intelsat | Zenit-3SL |
| Intelsat 28 | April 22, 2011 | Intelsat | Ariane 5 ECA |
| Intelsat 29e | January 27, 2016 | Intelsat | Ariane 5 ECA |
| Intelsat 30 | October 16, 2014 | — | Ariane 5 ECA |
| Intelsat 31 | June 9, 2016 | — | Proton-M |
| Intelsat 33e | August 24, 2016 | Intelsat | Ariane 5 ECA |
| Intelsat 34 | August 20, 2015 | Intelsat | Ariane 5 ECA |
| Intelsat 35e | July 5, 2017 | Intelsat | Falcon 9 Full Thrust |
| Intelsat 36 | August 24, 2016 | Intelsat | Ariane 5 ECA |
| Intelsat 37e | September 29, 2017 | Intelsat | Ariane 5 ECA |
| Intelsat 39 | August 6, 2019 | Intelsat | Ariane 5 ECA |
| Intelsat 3R | January 12, 1996 | PanAmSat | Ariane 44L |
| Intelsat 40e | April 7, 2023 | Intelsat | Falcon 9 Block 5 |
| Intelsat 5 | August 28, 1997 | Intelsat | Proton-K |
| Intelsat 601 | October 29, 1991 | Intelsat | Ariane 44L |
| Intelsat 602 | October 27, 1989 | Intelsat | Ariane 44L |
 Intelsat 603 | March 14, 1990 | Intelsat | Commercial Titan III |
| Intelsat 604 | June 23, 1990 | Intelsat | Commercial Titan III |
| Intelsat 605 | August 14, 1991 | Intelsat | Ariane 44L |
| Intelsat 6B | December 22, 1998 | — | Ariane 42L |
| Intelsat 7 | September 16, 1998 | Intelsat | Ariane 44LP |
| Intelsat 701 | October 22, 1993 | — | Ariane 44LP |
| Intelsat 702 | June 17, 1994 | — | Ariane 44LP |
| Intelsat 704 | January 10, 1995 | — | Atlas II |
| Intelsat 705 | March 22, 1995 | — | Atlas II |
| Intelsat 706 | May 17, 1995 | — | Ariane 44LP |
| Intelsat 707 | March 14, 1996 | — | Ariane 44LP |
| Intelsat 708 | February 14, 1996 | Intelsat | Long March 3B |
| Intelsat 709 | June 15, 1996 | — | Ariane 44P |
| Intelsat 8 | November 4, 1998 | PanAmSat | Proton-K |
| Intelsat 801 | March 1, 1997 | — | Ariane 44P |
| Intelsat 802 | June 25, 1997 | — | Ariane 44P |
| Intelsat 804 | December 22, 1997 | — | Ariane 42L |
| Intelsat 805 | June 18, 1998 | — | Atlas II |
| Intelsat 9 | July 28, 2000 | PanAmSat | Zenit-3SL |
| Intelsat 901 | June 9, 2001 | Intelsat | Ariane 44L |
| Intelsat 902 | August 30, 2001 | — | Ariane 44L |
| Intelsat 903 | March 30, 2002 | — | Proton-K |
| Intelsat 904 | February 23, 2002 | — | Ariane 44L |
| Intelsat 905 | June 5, 2002 | — | Ariane 44L |
| Intelsat 906 | September 6, 2002 | — | Ariane 44L |
| Intelsat 907 | February 15, 2003 | — | Ariane 44L |
 Intelsat I | April 6, 1965 | COMSAT | Delta D |
 Intelsat II F-1 | October 26, 1966 | Intelsat | Thor-Delta |
| Intelsat II F-2 | January 11, 1967 | Intelsat | Thor-Delta |
| Intelsat II F-3 | March 23, 1967 | Intelsat | Thor-Delta |
| Intelsat II F-4 | September 28, 1967 | Intelsat | Thor-Delta |
| Intelsat III F-1 | September 19, 1968 | Intelsat | Delta M |
| Intelsat III F-2 | December 19, 1968 | Intelsat | Delta M |
| Intelsat III F-3 | February 6, 1969 | Intelsat | Delta M |
| Intelsat III F-4 | May 22, 1969 | — | Delta M |
| Intelsat III F-5 | July 26, 1969 | — | Delta M |
| Intelsat III F-6 | January 15, 1970 | — | Delta M |
| Intelsat III F-7 | April 23, 1970 | — | Delta M |
| Intelsat III F-8 | July 23, 1970 | — | Delta M |
| Intelsat IV F-1 | May 22, 1975 | — | Atlas-Centaur |
| Intelsat IV F-2 | January 26, 1971 | — | Atlas-Centaur |
| Intelsat IV F-3 | December 20, 1971 | — | Atlas-Centaur |
| Intelsat IV F-4 | January 23, 1972 | — | Atlas-Centaur |
| Intelsat IV F-5 | June 13, 1972 | — | Atlas-Centaur |
| Intelsat IV F-6 | February 20, 1975 | — | Atlas-Centaur |
| Intelsat IV F-7 | August 23, 1973 | — | Atlas-Centaur |
| Intelsat IV F-8 | November 21, 1974 | — | Atlas-Centaur |
| Intelsat IVA F-1 | September 26, 1975 | — | Atlas-Centaur |
| Intelsat IVA F-2 | January 29, 1976 | — | Atlas-Centaur |
| Intelsat IVA F-3 | January 7, 1978 | — | Atlas-Centaur |
| Intelsat IVA F-4 | May 26, 1977 | — | Atlas-Centaur |
| Intelsat IVA F-5 | September 30, 1977 | — | Atlas-Centaur |
| Intelsat IVA F-6 | March 31, 1978 | — | Atlas-Centaur |
| Intelsat K | June 10, 1992 | — | Atlas II |
| Intelsat V F-1 | May 23, 1981 | — | Atlas-Centaur |
| Intelsat V F-2 | December 6, 1980 | — | Atlas-Centaur |
| Intelsat V F-3 | December 15, 1981 | — | Atlas-Centaur |
| Intelsat V F-4 | March 5, 1982 | — | Atlas-Centaur |
| Intelsat V F-5 | September 28, 1982 | — | Atlas-Centaur |
| Intelsat V F-6 | May 19, 1983 | — | Atlas-Centaur |
| Intelsat V F-7 | October 19, 1983 | — | Ariane 1 |
| Intelsat V F-8 | March 5, 1984 | — | Ariane 1 |
| Intelsat V F-9 | June 9, 1984 | — | Atlas G |
| Intelsat VA F-10 | March 22, 1985 | — | Atlas G |
| Intelsat VA F-11 | June 30, 1985 | — | Atlas G |
| Intelsat VA F-12 | September 28, 1985 | — | Atlas G |
| Intelsat VA F-14 | May 31, 1986 | — | Ariane 2 |
| Intelsat-32e | February 14, 2017 | Intelsat | Ariane 5 ECA |
| Interball Auroral Probe | August 29, 1996 | — | Molniya-M |
 Interball-1 | August 2, 1995 | — | Molniya-M |
| Intercosmos 15 | June 19, 1976 | — | Kosmos-3M |
| Intercosmos 17 | September 24, 1977 | — | Kosmos-3M |
| Intercosmos 18 | October 24, 1978 | — | Kosmos-3M |
| Intercosmos 19 | February 27, 1979 | — | Kosmos-3M |
| Intercosmos 2 | December 25, 1969 | — | Kosmos-2I |
| Intercosmos 20 | November 1, 1979 | — | Kosmos-3M |
| Intercosmos 21 | February 6, 1981 | — | Kosmos-3M |
| Intercosmos 24 | September 28, 1989 | — | Tsyklon-3 |
| Intercosmos 6 | April 7, 1972 | — | Voskhod |
 Intercosmos 8 | November 30, 1972 | — | Kosmos-2I |
 Interface Region Imaging Spectrograph | June 28, 2013 | Lockheed Martin Solar and Astrophysics Laboratory, Ames Research Center | Pegasus |
| Interhelioprobe | 2025 | — | Irtysh |
 Interkosmos 1 | October 14, 1969 | Interkosmos | Kosmos-2I |
| Interkosmos 10 | October 30, 1973 | Interkosmos | Kosmos-3M |
| Interkosmos 11 | May 17, 1974 | Interkosmos | Kosmos-3M |
| Interkosmos 12 | October 31, 1974 | Interkosmos | Kosmos-3M |
| Interkosmos 13 | March 27, 1975 | Interkosmos | Kosmos-3M |
| Interkosmos 14 | December 11, 1975 | Interkosmos | Kosmos-3M |
| Interkosmos 16 | July 27, 1976 | Interkosmos | Kosmos-3M |
| Interkosmos 3 | August 7, 1970 | Interkosmos | Kosmos-2I |
| Interkosmos 4 | October 14, 1970 | Interkosmos | Kosmos-2I |
| Interkosmos 5 | December 2, 1971 | Interkosmos | Kosmos-2I |
| Interkosmos 7 | June 30, 1972 | Interkosmos | Kosmos-2I |
| Interkosmos 9 | April 19, 1973 | Interkosmos | Kosmos-2I |
 Intermediate eXperimental Vehicle | February 11, 2015 | European Space Agency | Vega |
 International Cometary Explorer | August 12, 1978 | Goddard Space Flight Center | Delta 2000 |
 International Space Station | November 20, 1998 | European Space Agency, National Aeronautics and Space Administration, Canadian Space Agency, Roscosmos State Corporation, Japan Aerospace Exploration Agency | Proton-K |
 International Ultraviolet Explorer | January 26, 1978 | National Aeronautics and Space Administration, European Space Agency | Delta 2000 |
 Intershock | April 26, 1985 | — | Molniya |
| Interstage Adapter Satellite | January 25, 1994 | Ballistic Missile Defense Organization | Titan 23G |
 Interstellar Boundary Explorer | October 19, 2008 | Southwest Research Institute | Pegasus |
 Interstellar Mapping and Acceleration Probe | September 24, 2025 | Goddard Space Flight Center | Falcon 9 Block 5 |
 Intrepid | November 14, 1969 | National Aeronautics and Space Administration | Saturn V |
| Intruder 11 | September 13, 2012 | United States Navy | Atlas V 401 |
| Intruder 12 | September 13, 2012 | United States Navy | Atlas V 401 |
| Intruder 13 | October 8, 2015 | United States Navy | Atlas V 401 |
| Intruder 14 | October 8, 2015 | United States Navy | Atlas V 401 |
 Intuitive Machines-1 | February 15, 2024 | National Aeronautics and Space Administration, Intuitive Machines | Falcon 9 Block 5 |
| Intuitive Machines-2 | February 27, 2025 | National Aeronautics and Space Administration, Intuitive Machines | Falcon 9 Block 5 |
| INVADER | February 27, 2014 | — | H-IIA |
 IOD-1 GEMS | April 17, 2019 | Orbital Micro Systems | Antares |
| Ion Release Module | August 16, 1984 | Max Planck Institute for Extraterrestrial Physics | Delta 3000 |
| ION-MK01 | September 3, 2020 | — | Vega |
 Ionospheric Connection Explorer | October 11, 2019 | Space Sciences Laboratory | Pegasus |
 IRAS | January 26, 1983 | — | Delta 3000 |
| Iridium 10 | June 18, 1997 | — | Proton-K |
| Iridium 100 | October 9, 2017 | — | Falcon 9 Block 4 |
| Iridium 102 | January 14, 2017 | — | Falcon 9 Full Thrust |
| Iridium 103 | January 14, 2017 | — | Falcon 9 Full Thrust |
| Iridium 104 | January 14, 2017 | — | Falcon 9 Full Thrust |
| Iridium 105 | January 14, 2017 | — | Falcon 9 Full Thrust |
| Iridium 106 | January 14, 2017 | — | Falcon 9 Full Thrust |
| Iridium 107 | October 9, 2017 | — | Falcon 9 Block 4 |
| Iridium 108 | January 14, 2017 | — | Falcon 9 Full Thrust |
| Iridium 109 | January 14, 2017 | — | Falcon 9 Full Thrust |
| Iridium 111 | January 14, 2017 | — | Falcon 9 Full Thrust |
| Iridium 112 | January 14, 2017 | — | Falcon 9 Full Thrust |
| Iridium 113 | June 25, 2017 | — | Falcon 9 Full Thrust |
| Iridium 114 | January 14, 2017 | — | Falcon 9 Full Thrust |
| Iridium 115 | June 25, 2017 | — | Falcon 9 Full Thrust |
| Iridium 116 | December 23, 2017 | — | Falcon 9 Full Thrust |
| Iridium 117 | June 25, 2017 | — | Falcon 9 Full Thrust |
| Iridium 118 | June 25, 2017 | — | Falcon 9 Full Thrust |
| Iridium 119 | October 9, 2017 | — | Falcon 9 Block 4 |
| Iridium 11A | December 19, 1998 | Iridium Communications | Long March 2C |
| Iridium 12 | June 18, 1997 | — | Proton-K |
| Iridium 120 | June 25, 2017 | — | Falcon 9 Full Thrust |
| Iridium 121 | June 25, 2017 | — | Falcon 9 Full Thrust |
| Iridium 122 | October 9, 2017 | — | Falcon 9 Block 4 |
| Iridium 123 | June 25, 2017 | — | Falcon 9 Full Thrust |
| Iridium 124 | June 25, 2017 | — | Falcon 9 Full Thrust |
| Iridium 125 | October 9, 2017 | — | Falcon 9 Block 4 |
| Iridium 126 | June 25, 2017 | — | Falcon 9 Full Thrust |
| Iridium 128 | June 25, 2017 | — | Falcon 9 Full Thrust |
| Iridium 129 | October 9, 2017 | — | Falcon 9 Block 4 |
| Iridium 13 | June 18, 1997 | — | Proton-K |
| Iridium 130 | December 23, 2017 | — | Falcon 9 Full Thrust |
| Iridium 131 | December 23, 2017 | — | Falcon 9 Full Thrust |
| Iridium 132 | October 9, 2017 | — | Falcon 9 Block 4 |
| Iridium 133 | October 9, 2017 | — | Falcon 9 Block 4 |
| Iridium 134 | December 23, 2017 | — | Falcon 9 Full Thrust |
| Iridium 135 | December 23, 2017 | — | Falcon 9 Full Thrust |
| Iridium 136 | October 9, 2017 | — | Falcon 9 Block 4 |
| Iridium 137 | December 23, 2017 | — | Falcon 9 Full Thrust |
| Iridium 138 | December 23, 2017 | — | Falcon 9 Full Thrust |
| Iridium 139 | October 9, 2017 | — | Falcon 9 Block 4 |
| Iridium 140 | March 30, 2018 | — | Falcon 9 Block 4 |
| Iridium 141 | December 23, 2017 | — | Falcon 9 Full Thrust |
| Iridium 142 | March 30, 2018 | — | Falcon 9 Block 4 |
| Iridium 143 | March 30, 2018 | — | Falcon 9 Block 4 |
| Iridium 144 | March 30, 2018 | — | Falcon 9 Block 4 |
| Iridium 145 | March 30, 2018 | — | Falcon 9 Block 4 |
| Iridium 146 | March 30, 2018 | — | Falcon 9 Block 4 |
| Iridium 148 | March 30, 2018 | — | Falcon 9 Block 4 |
| Iridium 149 | March 30, 2018 | — | Falcon 9 Block 4 |
| Iridium 14A | June 11, 1999 | Iridium Communications | Long March 2C |
| Iridium 15 | July 9, 1997 | — | Delta II |
| Iridium 150 | March 30, 2018 | — | Falcon 9 Block 4 |
| Iridium 151 | December 23, 2017 | — | Falcon 9 Full Thrust |
| Iridium 153 | December 23, 2017 | — | Falcon 9 Full Thrust |
| Iridium 157 | March 30, 2018 | — | Falcon 9 Block 4 |
| Iridium 16 | June 18, 1997 | — | Proton-K |
| Iridium 17 | July 9, 1997 | — | Delta II |
| Iridium 18 | July 9, 1997 | — | Delta II |
| Iridium 20A | December 19, 1998 | Iridium Communications | Long March 2C |
| Iridium 21A | June 11, 1999 | Iridium Communications | Long March 2C |
| Iridium 22 | August 21, 1997 | — | Delta II |
| Iridium 23 | August 21, 1997 | — | Delta II |
| Iridium 24 | August 21, 1997 | — | Delta II |
| Iridium 25 | August 21, 1997 | — | Delta II |
| Iridium 26 | August 21, 1997 | — | Delta II |
 Iridium 33 | September 14, 1997 | Iridium Communications | Proton-K |
| Iridium 4 | May 5, 1997 | Iridium Communications | Delta II |
| Iridium 46 | December 20, 1997 | — | Delta II |
| Iridium 5 | May 5, 1997 | Iridium Communications | Delta II |
| Iridium 6 | May 5, 1997 | Iridium Communications | Delta II |
| Iridium 7 | May 5, 1997 | Iridium Communications | Delta II |
| Iridium 77 | September 8, 1998 | — | Delta II |
| Iridium 78 | August 19, 1998 | — | Long March 2C |
| Iridium 8 | May 5, 1997 | Iridium Communications | Delta II |
| Iridium 87 | November 6, 1998 | — | Delta II |
| Iridium 9 | June 18, 1997 | — | Proton-K |
| Iridium 911 | June 18, 1997 | Iridium Communications | Proton-K |
| Iridium 914 | June 18, 1997 | Iridium Communications | Proton-K |
| Iridium 920 | July 9, 1997 | Iridium Communications | Delta II |
| Iridium 921 | July 9, 1997 | Iridium Communications | Delta II |
| IRNSS-1A | July 1, 2013 | Indian Space Research Organisation | Polar Satellite Launch Vehicle-XL |
| IRNSS-1B | April 4, 2014 | Indian Space Research Organisation | Polar Satellite Launch Vehicle-XL |
| IRNSS-1C | October 15, 2014 | Indian Space Research Organisation | Polar Satellite Launch Vehicle-XL |
| IRNSS-1D | March 28, 2015 | Indian Space Research Organisation | Polar Satellite Launch Vehicle-XL |
| IRNSS-1E | January 20, 2016 | Indian Space Research Organisation | Polar Satellite Launch Vehicle-XL |
 IRNSS-1F | March 10, 2016 | Indian Space Research Organisation | Polar Satellite Launch Vehicle-XL |
| IRNSS-1G | April 28, 2016 | Indian Space Research Organisation | Polar Satellite Launch Vehicle-XL |
| IRNSS-1H | August 31, 2017 | Indian Space Research Organisation | Polar Satellite Launch Vehicle-XL |
| IRNSS-1I | April 11, 2018 | Indian Space Research Organisation | Polar Satellite Launch Vehicle-XL |
| IRS-1A | March 17, 1988 | Indian Space Research Organisation | Vostok-2M |
| IRS-1B | August 29, 1991 | Indian Space Research Organisation | Vostok-2M |
| IRS-1C | December 28, 1995 | Indian Space Research Organisation | Molniya-M |
| IRS-1D | September 29, 1997 | Indian Space Research Organisation | Polar Satellite Launch Vehicle-G |
| IRS-1E | September 20, 1993 | Indian Space Research Organisation | Polar Satellite Launch Vehicle |
| IRS-P2 | October 15, 1994 | Indian Space Research Organisation | Polar Satellite Launch Vehicle-G |
| IRS-P3 | March 21, 1996 | Indian Space Research Organisation | Polar Satellite Launch Vehicle-G |
| IRVE-1 | September 6, 2007 | Goddard Space Flight Center | Terrier Orion |
 IRVE-2 | August 17, 2009 | Goddard Space Flight Center | Black Brant |
 IRVE-3 | July 23, 2012 | Goddard Space Flight Center | Black Brant |
| IRVINE01 | November 11, 2018 | — | Electron |
| IRVINE02 | December 3, 2018 | — | Falcon 9 |
 IS-A | 1972 | — | — |
| IS-P | April 24, 1968 | Soviet Union | R-36 |
| ISAT | December 27, 2018 | — | Soyuz-2.1a |
 ISEE-1 | October 22, 1977 | — | Delta 2000 |
 ISEE-2 | October 22, 1977 | — | Delta 2000 |
| ISIS-1 | January 30, 1969 | — | Thor-Delta |
| ISIS-2 | April 1, 1971 | — | Thor-Delta |
| ISIS-C | August 1, 1975 | — | Delta |
| ISKRA 2 | April 19, 1982 | — | Proton-K |
| Iskra 3 | October 31, 1982 | — | Soyuz-U |
| Iskra-MAI-85 | July 14, 2017 | — | Soyuz-2.1a |
| ISS 1 | February 29, 1976 | — | N-I |
| ISS-B | February 16, 1978 | — | N-I |
| ISTP/Equator | September 30, 1989 | — | — |
| ISTSat-1 | July 9, 2024 | Instituto Superior Técnico | Ariane 62 |
| Italsat 1 | January 15, 1991 | Italian Space Agency | Ariane 44L |
| Italsat 2 | August 8, 1996 | Italian Space Agency | Ariane 44L |
| ITAMSAT | September 26, 1993 | AMSAT | Ariane 40 |
| ITASat-1 | December 3, 2018 | — | Falcon 9 Block 5 |
| ITF-1 | February 27, 2014 | University of Tsukuba | H-IIA |
| ITF-2 | December 9, 2016 | — | H-IIB |
| ITOS-B | October 21, 1971 | — | Thor-Delta |
| ITOS-E | July 16, 1973 | — | Delta 0100 |
| ITOS-E2 | September 23, 1976 | — | Delta |
| ITOS-I | July 1, 1977 | — | Delta |
| ITOS-J | December 1, 1979 | — | Delta |
| ITUpSAT1 | September 23, 2009 | ITU Faculty of Aeronautics and Astronautics | Polar Satellite Launch Vehicle |
| İMECE | April 15, 2023 | — | Falcon 9 |