| BADR 7 | November 10, 2015 | — | Ariane 5 ECA |
| BADR-1 | February 28, 2006 | — | Proton-M |
| Badr-1 | July 16, 1990 | Space and Upper Atmosphere Research Commission | Long March 2E |
| BADR-2سكس | October 9, 1998 | — | Atlas II |
| BADR-3 | February 26, 1999 | Arab Satellite Communications Organization | Ariane 44L |
| BADR-4 | November 8, 2006 | Arab Satellite Communications Organization | Proton-M |
| BADR-5 | June 3, 2010 | — | Proton-M |
| BADR-6 | July 7, 2008 | — | Ariane 5 ECA |
| BADR-8 | May 27, 2023 | Arab Satellite Communications Organization | Falcon 9 Block 5 |
Badr-II | December 10, 2001 | Space and Upper Atmosphere Research Commission | Zenit-2 |
Bangladesh Satellite-1 | May 11, 2018 | Thales Alenia Space | Falcon 9 Block 5 |
Banxing 1 | September 25, 2008 | — | Long March 2F |
Bard | July 23, 2025 | York Space Systems | Falcon 9 Block 5 |
| Barry 1 | November 11, 2023 | Rogue Space Systems Corporation | Falcon 9 Block 5 |
| BATSAT | February 26, 1998 | Teledesic | Pegasus-XL |
| Batsú-CS1 | April 2, 2018 | — | Falcon 9 |
| Beacon 1 | October 23, 1958 | — | Juno I |
Beacon 2 | August 15, 1959 | — | Juno II |
Beacon Explorer C | April 29, 1965 | National Aeronautics and Space Administration | Scout X-4 |
Beacon Explorer-A | March 19, 1964 | National Aeronautics and Space Administration | Delta B |
Beacon Explorer-B | October 10, 1964 | National Aeronautics and Space Administration | Scout X-4 |
Beagle 2 | June 2, 2003 | National Space Centre | Soyuz-FG |
| BeEagleSat | April 18, 2017 | — | Atlas V 401 |
BeeSat-1 | September 23, 2009 | Technische Universität Berlin | Polar Satellite Launch Vehicle |
| BeeSat-2 | April 19, 2013 | Technische Universität Berlin | Soyuz-2.1a |
| BeeSat-3 | April 19, 2013 | Technische Universität Berlin | Soyuz-2.1a |
| BeeSat-4 | June 22, 2016 | Technische Universität Berlin | Polar Satellite Launch Vehicle-XL |
| Beidou G6 | October 25, 2012 | — | Long March 3C |
| Beidou G7 | June 12, 2016 | — | Long March 3C |
| Beidou I1-S | March 30, 2015 | — | Long March 3C |
| Beidou I2-S | September 29, 2015 | — | Long March 3B |
| Beidou IGSO 4 | July 26, 2011 | — | Long March 3A |
| Beidou M3 | April 29, 2012 | — | Long March 3B |
| Beidou M3-S | February 1, 2016 | — | Long March 3C |
| Beidou-1A | October 30, 2000 | — | Long March 3A |
| Beidou-1B | December 20, 2000 | — | Long March 3A |
| Beidou-1C | May 24, 2003 | — | Long March 3A |
| Beidou-1D | February 2, 2007 | — | Long March 3A |
| Beidou-2 G1 | January 16, 2010 | — | Long March 3C |
| Beidou-2 G2 | April 14, 2009 | — | Long March 3A |
| Beidou-2 G3 | June 2, 2010 | — | Long March 3C |
| Beidou-2 G4 | October 31, 2010 | — | Long March 3C |
| Beidou-2 G5 | February 24, 2012 | — | Long March 3C |
| Beidou-2 IGSO 1 | July 31, 2010 | — | Long March 3A |
| Beidou-2 IGSO 2 | December 17, 2010 | — | Long March 3A |
| Beidou-2 IGSO 5 | December 1, 2011 | — | Long March 3A |
| Beidou-2 IGSO 6 | March 29, 2016 | — | Long March 3A |
| Beidou-2 IGSO-3 | April 9, 2011 | — | Long March 3A |
| Beidou-2 M1 | April 13, 2007 | — | Long March 3A |
| Beidou-2 M4 | April 29, 2012 | — | Long March 3B |
| Beidou-2 M5 | September 18, 2012 | — | Long March 3B |
| Beidou-2 M6 | September 18, 2012 | — | Long March 3B |
| BeiDou-3 M1 | November 5, 2017 | — | Long March 3B |
| Beidou-3 M1S | July 25, 2015 | — | Long March 3B |
| BEIDOU-3 M2 | November 5, 2017 | — | Long March 3B |
| Beidou-3 M2S | July 25, 2015 | — | Long March 3B |
Belintersat-1 | January 15, 2016 | — | Long March 3B |
| BelKA | July 26, 2006 | National Academy of Sciences of Belarus | Dnepr |
Bell | April 21, 2013 | National Aeronautics and Space Administration | Antares |
BeppoSAX | April 30, 1996 | Italian Space Agency | Atlas I |
Beresheet | February 22, 2019 | Israel Aerospace Industries Ltd | Falcon 9 Block 5 |
| BermudaSat-1 | July 14, 2000 | SES S.A. | Atlas IIAS |
Bevo-1 | July 15, 2009 | University of Texas at Austin | Space Shuttle |
| Bevo-2 | December 6, 2015 | University of Texas at Austin | Atlas V 401 |
| BGUSAT | February 15, 2017 | Israel Aerospace Industries Ltd, Ben-Gurion University of the Negev | Polar Satellite Launch Vehicle-XL |
| Bhaskara I | June 7, 1979 | Indian Space Research Organisation | Kosmos-3M |
| Bhaskara-II | November 20, 1981 | Indian Space Research Organisation | Kosmos-3M |
BHUTAN-1 | June 29, 2018 | — | Falcon 9 |
Bigelow Expandable Activity Module | April 8, 2016 | — | Falcon 9 Full Thrust |
| Bilibili Video Satellite | September 15, 2020 | Bilibili | Long March 11 |
| BILSAT-1 | September 27, 2003 | TÜBİTAK Space Technologies Research Institute | Kosmos-3M |
Biomass | April 29, 2025 | European Space Operations Centre | Vega C |
| Bion 1 | October 31, 1973 | Russian Academy of Sciences | Soyuz-U |
Bion 10 | December 29, 1992 | Russian Academy of Sciences | Soyuz-U |
| Bion 11 | December 24, 1996 | Russian Academy of Sciences | Soyuz-U |
Bion 2 | October 22, 1974 | Russian Academy of Sciences | Soyuz-U |
Bion 3 | November 25, 1975 | Russian Academy of Sciences | Soyuz-U |
Bion 4 | August 3, 1977 | Russian Academy of Sciences | Soyuz-U |
Bion 5 | September 25, 1979 | Russian Academy of Sciences | Soyuz-U |
Bion 6 | December 14, 1983 | Russian Academy of Sciences | Soyuz-U |
Bion 7 | July 10, 1985 | Russian Academy of Sciences | Soyuz-U |
Bion 8 | September 29, 1987 | Russian Academy of Sciences | Soyuz-U |
Bion 9 | September 15, 1989 | Russian Academy of Sciences | Soyuz-U |
Bion-M No.1 | April 19, 2013 | Russian Academy of Sciences | Soyuz-2.1a |
| Bion-M No.2 | August 20, 2025 | — | Soyuz-2.1b |
Biosatellite 1 | December 14, 1966 | National Aeronautics and Space Administration | Delta G |
Biosatellite 2 | September 7, 1967 | National Aeronautics and Space Administration | Delta G |
Biosatellite 3 | June 29, 1969 | National Aeronautics and Space Administration | Delta N |
BioSentinel | November 16, 2022 | National Aeronautics and Space Administration | Space Launch System Block 1 |
| BIRD | October 22, 2001 | German Aerospace Center | Polar Satellite Launch Vehicle |
BIROS | June 22, 2016 | German Aerospace Center | Polar Satellite Launch Vehicle-XL |
BKA | July 22, 2012 | — | Soyuz-FG |
| BlackCAT | January 11, 2026 | Pennsylvania State University | Falcon 9 Block 5 |
BLITS | September 17, 2009 | Roscosmos State Corporation | Soyuz-2.1b |
Blue Ghost Mission 1 | January 15, 2025 | Firefly Aerospace | Falcon 9 Block 5 |
| Blue Ghost Mission 2 | 2026 | Firefly Aerospace | — |
| Blue Ring Pathfinder | January 16, 2025 | Blue Origin | New Glenn |
| Bluebell 2C (Cylinder) | February 15, 1966 | — | Atlas SLV-3 Agena-D |
| Bluebell 2S (Sphere) | February 15, 1966 | — | Atlas SLV-3 Agena-D |
| BlueBird 2 | September 12, 2024 | AST SpaceMobile | Falcon 9 Block 5 |
| BlueBird 1 | September 12, 2024 | AST SpaceMobile | Falcon 9 Block 5 |
| BlueBird 10 | June 17, 2026 | AST SpaceMobile | Falcon 9 Block 5 |
| BlueBird 11 | August 5, 2026 | AST SpaceMobile | Falcon 9 Block 5 |
| BlueBird 12 | August 5, 2026 | AST SpaceMobile | Falcon 9 Block 5 |
| BlueBird 13 | August 5, 2026 | AST SpaceMobile | Falcon 9 Block 5 |
| BlueBird 3 | September 12, 2024 | AST SpaceMobile | Falcon 9 Block 5 |
| BlueBird 4 | September 12, 2024 | AST SpaceMobile | Falcon 9 Block 5 |
| BlueBird 5 | September 12, 2024 | AST SpaceMobile | Falcon 9 Block 5 |
| BlueBird 6 | December 24, 2025 | AST SpaceMobile | Launch Vehicle Mark III |
| BlueBird 7 | April 19, 2026 | AST SpaceMobile | New Glenn |
| BlueBird 8 | June 17, 2026 | AST SpaceMobile | Falcon 9 Block 5 |
| BlueBird 9 | June 17, 2026 | AST SpaceMobile | Falcon 9 Block 5 |
| BlueWalker 1 | April 1, 2019 | AST SpaceMobile, Kongsberg NanoAvionics | Polar Satellite Launch Vehicle-QL |
BlueWalker 3 | September 11, 2022 | AST SpaceMobile | Falcon 9 Block 5 |
| Bonum 1 | November 22, 1998 | — | Delta II |
| BOTAN | September 14, 2025 | — | Falcon 9 Block 5 |
| BOTSAT-1 | March 15, 2025 | Botswana International University of Science and Technology | Falcon 9 Block 5 |
| BRAC Onnesha | June 3, 2017 | — | Falcon 9 |
| BrasilSat A1 | February 8, 1985 | — | Ariane 3 |
| Brasilsat B1 | August 10, 1994 | Embratel | Ariane 44LP |
| Brazilsat 2 | March 28, 1986 | — | Ariane 3 |
| Brazilsat B2 | March 28, 1995 | Embratel | Ariane 44LP |
| Brazilsat B3 | February 4, 1998 | — | Ariane 44LP |
BremSat | February 3, 1994 | — | Space Shuttle |
BRICSat-2 | June 25, 2019 | — | Falcon Heavy |
| BRICSat-P | May 20, 2015 | — | Atlas V 501 |
Brik-II (satellite) | June 30, 2021 | Ministry of Defence of the Netherlands | LauncherOne |
| BRIsat | June 18, 2016 | — | Ariane 5 ECA |
| BRITE-Austria | February 25, 2013 | Graz University of Technology | Polar Satellite Launch Vehicle |
BRITE-Heweliusz | August 19, 2014 | Space Research Centre, Polish Academy of Sciences, Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences | Long March 4B |
BRITE-Lem | November 21, 2013 | Space Research Centre, Polish Academy of Sciences, Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences | Dnepr |
| BRITE-Montréal | June 19, 2014 | UTIAS Space Flight Laboratory | Dnepr |
| BRITE-Toronto | June 19, 2014 | UTIAS Space Flight Laboratory | Dnepr |
| BS-2A | January 23, 1984 | — | N-II |
| BS-2B | February 12, 1986 | — | N-II |
| BS-3A | August 28, 1990 | — | H-I |
| BS-3B | August 25, 1991 | — | H-I |
| BS-3H | April 18, 1991 | — | Atlas I |
| BS-3N | July 8, 1994 | — | Ariane 44L |
| BSAT 1B | April 28, 1998 | — | Ariane 44P |
| BSAT 2A | March 8, 2001 | — | Ariane 5G |
| BSAT-1a | April 16, 1997 | Broadcasting Satellite System Corporation | Ariane 44LP |
| BSAT-2b | July 12, 2001 | — | Ariane 5G |
| BSAT-2c | June 11, 2003 | — | Ariane 5G |
| BSAT-3a | August 14, 2007 | — | Ariane 5 ECA |
| BSAT-3b | October 28, 2010 | — | Ariane 5 ECA |
| BSAT-3c | August 6, 2011 | — | Ariane 5 ECA |
| BSAT-4a | September 29, 2017 | Broadcasting Satellite System Corporation | Ariane 5 ECA |
| BSAT-4b | August 15, 2020 | — | Ariane 5 ECA |
| BugSat 1 | June 19, 2014 | Satellogic | Dnepr |
| Bulgaria 1300 | August 7, 1981 | Space Research and Technology Institute | Vostok-2M |
BulgariaSat-1 | June 23, 2017 | Bulgaria Sat | Falcon 9 Full Thrust |
BurstCube | March 21, 2024 | Goddard Space Flight Center | Falcon 9 Block 5 |