 TabletSat-Aurora | June 19, 2014 | — | Dnepr |
 TACHELES | April 1, 2026 | Neurospace | Space Launch System Block 1 |
 TACOMSAT | February 9, 1969 | — | Titan IIIC |
 TacSat-2 | December 16, 2006 | Air Force Research Laboratory | Minotaur I |
 TacSat-3 | May 19, 2009 | United States Air Force, Air Force Research Laboratory | Minotaur I |
 TacSat-4 | September 27, 2011 | Air Force Research Laboratory, United States Naval Research Laboratory | Minotaur IV |
 TacSat-6 | December 6, 2013 | United States Army Space and Missile Defense Command, Operationally Responsive Space Office | Atlas V 501 |
| Taiji-1 | August 30, 2019 | — | Kuaizhou |
| Taiyo (satellite) | February 24, 1975 | — | M-3C |
| Tanager-1 | August 16, 2024 | — | — |
| Tancredo-1 | December 9, 2016 | — | H-IIB |
 TanDEM-X | June 21, 2010 | German Aerospace Center | Dnepr |
| TanSat | December 21, 2016 | Ministry of Science and Technology of the People's Republic of China | Long March 2D |
| Tansei | February 16, 1971 | — | M-4S |
| Tansei 2 | February 16, 1974 | — | M-3C |
| Tansei 3 | February 19, 1977 | — | M-3H |
| Tansei 4 | February 17, 1980 | — | M-3S |
 TAOS | March 13, 1994 | — | Minotaur-C |
| TARANIS | November 17, 2020 | CNES | Vega |
| Tatiana | January 20, 2005 | — | Kosmos-3M |
| TBEX-A | June 25, 2019 | — | Falcon Heavy |
 TD-1A | March 12, 1972 | — | Delta N |
| TDF 1 | October 28, 1988 | TDF Group | Ariane 2 |
| TDF 2 | July 24, 1990 | TDF Group | Ariane 44L |
 TDRS-1 | April 4, 1983 | National Aeronautics and Space Administration | Space Shuttle |
 TDRS-10 | December 5, 2002 | National Aeronautics and Space Administration | Atlas II |
 TDRS-11 | January 31, 2013 | National Aeronautics and Space Administration | Atlas V 401 |
 TDRS-12 | January 24, 2014 | National Aeronautics and Space Administration | Atlas V 401 |
 TDRS-13 | August 18, 2017 | National Aeronautics and Space Administration | Atlas V 401 |
 TDRS-3 | September 29, 1988 | National Aeronautics and Space Administration | Space Shuttle |
 TDRS-4 | March 13, 1989 | National Aeronautics and Space Administration | Space Shuttle |
 TDRS-5 | August 2, 1991 | National Aeronautics and Space Administration | Space Shuttle |
 TDRS-6 | January 13, 1993 | National Aeronautics and Space Administration | Space Shuttle |
 TDRS-7 | July 13, 1995 | National Aeronautics and Space Administration | Space Shuttle |
 TDRS-8 | June 30, 2000 | National Aeronautics and Space Administration | Atlas II |
 TDRS-9 | March 8, 2002 | National Aeronautics and Space Administration | Atlas II |
 TDRS-B | January 28, 1986 | National Aeronautics and Space Administration | Space Shuttle |
 TechEdSat 1 | July 21, 2012 | San José State University, ÅAC Microtec, Ames Research Center | H-IIB |
 TechEdSat 3p | August 3, 2013 | — | H-IIB |
| TechloSat | July 14, 2017 | — | Soyuz-2.1a |
| Technology Experiment Satellite | October 22, 2001 | Indian Space Research Organisation | Polar Satellite Launch Vehicle |
 TecSAR-1 | January 21, 2008 | Visual Intelligence Division | Polar Satellite Launch Vehicle |
| TeikyoSat-3 | February 27, 2014 | Teikyo University | H-IIA |
| Tele-X | April 2, 1989 | SES Sirius | Ariane 2 |
| Telecom 2A | December 16, 1991 | — | Ariane 44L |
| TELECOM 2B | April 15, 1992 | — | Ariane 44L |
| Telecom 2C | December 6, 1995 | — | Ariane 44L |
| Telecom 2D | August 8, 1996 | — | Ariane 44L |
| TeLEOS-1 | December 16, 2015 | — | Polar Satellite Launch Vehicle |
| Telesat 5 | November 11, 1982 | Telesat | Space Shuttle |
| Telesat 6 | June 18, 1983 | Telesat | Space Shuttle |
 Telesat-I | April 12, 1985 | Telesat | Space Shuttle |
| Telkom 1 | August 12, 1999 | — | Ariane 42P |
| Telkom 4 | August 7, 2018 | — | Falcon 9 Block 5 |
| Telkom-2 | November 16, 2005 | Telkom Indonesia | Ariane 5 ECA |
| Telkom-3 | August 6, 2012 | Telkom Indonesia | Proton-M |
| Telkom-3S | February 14, 2017 | Telkomsat | Ariane 5 ECA |
 Telstar 1 | July 10, 1962 | National Aeronautics and Space Administration | Thor-Delta |
| Telstar 10 | October 16, 1997 | — | Long March 3B |
| Telstar 11 | November 29, 1994 | Telesat | Atlas II |
| Telstar 11N | February 26, 2009 | — | Zenit-3SLB |
| Telstar 12 | October 19, 1999 | Telesat | Ariane 44LP |
| Telstar 12V | November 24, 2015 | — | H-IIA |
| Telstar 14 | January 11, 2004 | Telesat | Zenit-3SL |
| Telstar 14R | May 20, 2011 | Telesat | Proton-M |
| Telstar 18 | June 29, 2004 | Telesat | Zenit-3SL |
| Telstar 18V | September 10, 2018 | Telesat | Falcon 9 Block 5 |
| Telstar 19V | July 22, 2018 | Telesat | Falcon 9 Block 5 |
 Telstar 2 | May 7, 1963 | — | Delta B |
| Telstar 301 | July 28, 1983 | Arab Satellite Communications Organization, AT&T Corporation | Delta 3000 |
| Telstar 302 | August 30, 1984 | AT&T Corporation | Space Shuttle |
| Telstar 303 | June 17, 1985 | AT&T Corporation | Space Shuttle |
| Telstar 4 | September 24, 1995 | — | Ariane 42L |
| Telstar 401 | December 16, 1993 | AT&T Corporation | Atlas II |
| Telstar 402 | September 9, 1994 | — | Ariane 42L |
| TEMISAT | August 31, 1993 | — | Tsyklon-3 |
| Tempo 2 | March 8, 1997 | — | Atlas II |
| Tempsat-1 | August 13, 1965 | — | Thor-Ablestar |
| Ten-Koh-2 | October 26, 2025 | — | H3 Launch Vehicle |
 Tenacious | January 15, 2025 | ispace Inc | Falcon 9 Block 5 |
| TenKoh | October 29, 2018 | — | H-IIA |
 Tenma | February 20, 1983 | — | M-3S |
 Terra | December 18, 1999 | National Aeronautics and Space Administration | Atlas II |
 TerraSAR-X | June 15, 2007 | German Aerospace Center | Dnepr |
 TERRIERS | May 18, 1999 | National Aeronautics and Space Administration | Pegasus-XL |
 TET-1 | July 22, 2012 | German Aerospace Center | Soyuz-FG |
| TETR 1 | December 13, 1967 | — | Thor-Delta |
| TETR 2 | November 8, 1968 | — | Thor-Delta |
| TETR 4 | September 29, 1971 | — | Delta N |
| TEX | April 11, 1990 | — | SM-65E Atlas |
| THAICOM 1A | December 18, 1993 | — | Ariane 44L |
| THAICOM 2 | October 8, 1994 | — | Ariane 44L |
| Thaicom 3 | April 16, 1997 | Gulf Space Technology | Ariane 44LP |
| Thaicom 4 | August 11, 2005 | Gulf Space Technology | Ariane 5GS |
| Thaicom 5 | May 27, 2006 | Gulf Space Technology | Ariane 5 ECA |
| Thaicom 6 | January 6, 2014 | Gulf Space Technology | Falcon 9 v1.1 |
| Thaicom 8 | May 27, 2016 | Gulf Space Technology | Falcon 9 Full Thrust |
 THEMIS-A | February 17, 2007 | National Aeronautics and Space Administration | Delta II |
| THEMIS-B | February 17, 2007 | National Aeronautics and Space Administration | Delta II |
| THEMIS-C | February 17, 2007 | National Aeronautics and Space Administration | Delta II |
| THEMIS-D | February 17, 2007 | National Aeronautics and Space Administration | Delta II |
| THEMIS-E | February 17, 2007 | National Aeronautics and Space Administration | Delta II |
| THEOS-1 | October 1, 2008 | Geo-Informatics and Space Technology Development Agency | Dnepr |
| THEOS-2 | October 9, 2023 | Geo-Informatics and Space Technology Development Agency | Vega |
| THOR 1 | August 18, 1990 | — | Delta II |
| Thor 2A | May 20, 1997 | — | Delta II |
| Thor 3 | June 10, 1998 | — | Delta II |
| Thor 5 | February 11, 2008 | Telenor Satellite | Proton-M |
| Thor 6 | October 29, 2009 | Telenor Satellite | Ariane 5 ECA |
| THOR 7 | April 26, 2015 | — | Ariane 5 ECA |
| Thuraya 1 | October 21, 2000 | — | Zenit-3SL |
| Thuraya 2 | June 10, 2003 | Thuraya | Zenit-3SL |
| Thuraya 3 | January 15, 2008 | — | Zenit-3SL |
| Thuraya 4 | January 4, 2025 | Space42 | Falcon 9 Block 5 |
 Tiangong space station | July 24, 2022 | China National Space Administration | — |
 Tiangong-1 | September 29, 2011 | China National Space Administration | Long March 2F |
 Tiangong-2 | September 15, 2016 | China National Space Administration | Long March 2F |
| Tianhui 1-03 | October 26, 2015 | — | Long March 2D |
| Tianhui 1A | August 24, 2010 | China Aerospace Science and Technology Corporation | Long March 2D |
| Tianhui 1B | May 6, 2012 | — | Long March 2D |
| Tiankun-1 | March 2, 2017 | China Aerospace Science and Industry Corporation Limited | Kaituozhe-2 |
| TIANLIAN 1-03 | July 25, 2012 | — | Long March 3C |
| Tianlian I-01 | April 25, 2008 | China Aerospace Science and Technology Corporation | Long March 3C |
| Tianlian I-02 | July 11, 2011 | — | Long March 3C |
| Tianlian I-05 | July 6, 2021 | China Aerospace Science and Technology Corporation | Long March 3C |
| Tianlian II | March 31, 2019 | — | Long March 3B |
| Tianqin-1 | December 20, 2019 | — | Long March 4B |
| Tiantong-1 1 | August 5, 2016 | — | Long March 3B |
| Tiantong-1 2 | November 12, 2020 | — | Long March 3B |
| Tiantong-1 3 | January 19, 2021 | — | Long March 3B |
| Tiantuo 1 | May 10, 2012 | — | Long March 4B |
 Tianwen-1 | July 23, 2020 | China National Space Administration | Long March 5 |
 Tianwen-2 | May 28, 2025 | China National Space Administration | Long March 3B |
| Tianyuan 1 | June 25, 2016 | — | Long March 7 |
 Tianzhou 1 | April 20, 2017 | — | Long March 7 |
 Tianzhou 2 | May 29, 2021 | China National Space Administration | Long March 7 |
 Tianzhou 3 | September 20, 2021 | China National Space Administration | Long March 7 |
 Tianzhou 4 | May 9, 2022 | China National Space Administration | Long March 7 |
 Tianzhou 5 | November 12, 2022 | China National Space Administration | Long March 7 |
 Tianzhou 6 | May 10, 2023 | China National Space Administration | Long March 7 |
 Tianzhou 7 | January 17, 2024 | — | Long March 7 |
 Tianzhou 8 | November 15, 2024 | — | Long March 7 |
 Tianzhou 9 | July 14, 2025 | — | Long March 7 |
| Tiba 1 | November 26, 2019 | — | Ariane 5 ECA |
| TigriSat | June 19, 2014 | — | Dnepr |
 TIMED | December 7, 2001 | National Aeronautics and Space Administration | Delta II |
| Tintin A | February 22, 2018 | — | Falcon 9 |
| Tintin B | February 22, 2018 | — | Falcon 9 |
| TIP 1 | September 2, 1972 | United States Navy | Scout B1 |
 TiPS 1a | May 12, 1996 | United States Naval Research Laboratory | Titan IV |
| TiPS 1b | May 12, 1996 | United States Naval Research Laboratory | Titan IV |
 TIROS-1 | April 1, 1960 | Environmental Science Services Administration, National Aeronautics and Space Administration | Thor Able II |
 TIROS-10 | July 2, 1965 | National Aeronautics and Space Administration, Environmental Science Services Administration | Delta C |
 TIROS-2 | November 23, 1960 | National Aeronautics and Space Administration, Environmental Science Services Administration | Thor-Delta |
 TIROS-3 | July 12, 1961 | National Aeronautics and Space Administration, Environmental Science Services Administration | Thor-Delta |
 TIROS-4 | February 8, 1962 | Environmental Science Services Administration, National Aeronautics and Space Administration | Thor-Delta |
 TIROS-5 | June 19, 1962 | Environmental Science Services Administration, National Aeronautics and Space Administration | Thor-Delta |
 TIROS-6 | September 18, 1962 | National Aeronautics and Space Administration, Environmental Science Services Administration | Thor-Delta |
 TIROS-7 | June 19, 1963 | National Aeronautics and Space Administration, Environmental Science Services Administration | Delta B |
 TIROS-8 | December 21, 1963 | Environmental Science Services Administration, National Aeronautics and Space Administration | Delta B |
 TIROS-9 | January 22, 1965 | Environmental Science Services Administration | Delta C |
 TIROS-M | January 23, 1970 | — | Thor-Delta |
| TIROS-N | October 13, 1978 | National Oceanic and Atmospheric Administration | Atlas E/F |
| TIsat-1 | July 12, 2010 | — | Polar Satellite Launch Vehicle |
| TiungSAT-1 | September 26, 2000 | — | Dnepr |
| TJS-1 | September 12, 2015 | — | Long March 3B |
| TJS-2 | January 5, 2017 | — | Long March 3B |
| TMSAT | July 10, 1998 | — | Zenit-2 |
| Toloo | July 27, 2017 | — | — |
 TOMS-EP | July 2, 1996 | Goddard Space Flight Center | Pegasus-XL |
| Tool bag dropped during Expedition 70 EVA 2 | — | — | — |
| Tool bag dropped during STS-126 EVA 1 | — | — | — |
 TOPEX/Poseidon | August 10, 1992 | — | Ariane 42P |
| TOPO 1 | April 8, 1970 | — | Thorad-Agena D |
 TopSat | October 27, 2005 | British National Space Centre, Ministry of Defence | Kosmos-3M |
| Torga | July 7, 2026 | LusoSpace | Falcon 9 Block 5 |
| Tournesol | April 15, 1971 | — | Diamant |
| TRACERS-A | July 23, 2025 | University of Iowa Department of Physics and Astronomy | Falcon 9 Block 5 |
| TRACERS-B | July 23, 2025 | University of Iowa Department of Physics and Astronomy | Falcon 9 Block 5 |
| TRAILBLAZER | November 20, 2013 | — | Minotaur I |
| Trailblazer | August 3, 2008 | Missile Defense Agency, United States Air Force | Falcon 1 |
| Transit 11 | January 28, 1966 | — | Scout A |
| Transit 12 | March 26, 1966 | — | Scout A |
| Transit 13 | May 19, 1966 | — | Scout A |
| Transit 14 | August 18, 1966 | — | Scout A |
 Transit 1A | September 17, 1959 | — | Thor Able II |
 Transit 1B | April 13, 1960 | — | Thor-Ablestar |
 Transit 2A | June 22, 1960 | — | Thor-Ablestar |
 Transit 3B | February 22, 1961 | — | Thor-Ablestar |
| Transit 4A | June 29, 1961 | — | Thor-Ablestar |
| Transit 4B | November 15, 1961 | — | Thor-Ablestar |
| Transit 5A | December 19, 1962 | — | Scout X-3 |
| Transit 5A3 | June 16, 1963 | — | Scout X-3 |
| Transit 5B-1 | September 28, 1963 | — | Thor-Ablestar |
| Transit 5B-2 | December 5, 1963 | — | Thor-Ablestar |
| Transit 5B-4 | October 6, 1964 | — | Thor-Ablestar |
| Transit 5B-5 | December 13, 1964 | — | Thor-Ablestar |
| Transit 5B-7 | August 13, 1965 | — | Thor-Ablestar |
 Transit 5E-1 | September 28, 1963 | — | Thor-Ablestar |
| Transit 9 | June 4, 1964 | — | Scout X-4 |
| Transit O-4 | June 24, 1965 | — | Thor-Ablestar |
| Transit O-6 | December 22, 1965 | — | Scout A |
 Transit Research and Attitude Control | November 15, 1961 | United States Navy | Thor-Ablestar |
| Transit-O 3 | March 11, 1965 | — | Thor-Ablestar |
 Transiting Exoplanet Survey Satellite | April 18, 2018 | Massachusetts Institute of Technology | Falcon 9 Full Thrust |
 Transition Region and Coronal Explorer | April 2, 1998 | National Aeronautics and Space Administration | Pegasus-XL |
| Transtage 5 | June 18, 1965 | — | Titan IIIC |
| TRICOM-1 | January 14, 2017 | — | SS-520-4 |
| Trident (spacecraft) | October 2025 | National Aeronautics and Space Administration | — |
 Trisat | September 3, 2020 | University of Maribor | Vega |
 TRISHNA | 2026 | — | — |
| TRITON | October 9, 2023 | Taiwan Space Agency | Vega |
| TROLL | January 14, 2025 | TRL Space | — |
 Tropical Rainfall Measuring Mission | November 27, 1997 | Japan Aerospace Exploration Agency | H-II |
| TRS 1 | September 17, 1962 | — | Thor-Agena B |
| TRS 2 | May 9, 1963 | — | Atlas-Agena B |
| TSAT | April 18, 2014 | — | Falcon 9 v1.1 |
| TSS-1 | June 25, 1992 | — | Space Shuttle |
| TSS-1R | February 22, 1996 | — | Space Shuttle |
 TSUBAME | November 6, 2014 | — | Dnepr |
| TSX-5 | June 7, 2000 | Space Test Program | Pegasus-XL |
| TTU101 | July 5, 2019 | — | Soyuz-2.1b |
| TTÜ100 | September 3, 2020 | Tallinn University of Technology | Vega |
 TUBSAT-1 | July 17, 1991 | — | Ariane 40 |
| TUBSAT-2 | January 25, 1994 | — | Tsyklon-3 |
| Tubsat-N | July 7, 1998 | — | Shtil' |
| TUBSAT-N1 | July 7, 1998 | — | Shtil' |
 TUGKE-1 | March 13, 2024 | Cabinet Satellite Information Center | Space One KAIROS |
| TUMnanoSAT | November 20, 1998 | — | Proton-K |
| Turkmenistan Memorial Capsule | August 23, 2005 | — | Dnepr |
| TurkSat-3USat | April 26, 2013 | — | Long March 2D |
| TV-D2 | 2023 | Indian Space Research Organisation | — |
| TV-Sat 1 | November 21, 1987 | Deutsche Bundespost | Ariane 2 |
| TV-Sat 2 | August 8, 1989 | Deutsche Telekom | Ariane 44LP |
 Tyazhely Sputnik | February 4, 1961 | — | Molniya |
| Tyche | August 16, 2024 | UK Space Command | — |
| TYVAK-61C | January 12, 2018 | — | Polar Satellite Launch Vehicle-XL |
| Télécom 1A | August 4, 1984 | France Télécom | Ariane 3 |
| Télécom 1B | May 8, 1985 | France Télécom | Ariane 3 |
| Télécom 1C | March 11, 1988 | France Télécom | Ariane 3 |
| Túpac Katari 1 | December 20, 2013 | — | Long March 3B |
| TürkmenÄlem 52°E | April 27, 2015 | MonacoSAT, Turkmenistan National Space Agency | Falcon 9 v1.1 |
| Türksat 1A | January 24, 1994 | Türksat | Ariane 44LP |
| Türksat 1B | August 10, 1994 | Türksat | Ariane 44LP |
| Türksat 1C | July 9, 1996 | Türksat | Ariane 44L |
| Türksat 2A | January 10, 2001 | Türksat | Ariane 44P |
| Türksat 3A | June 12, 2008 | Türksat | Ariane 5 ECA |
| Türksat 4A | February 14, 2014 | Türksat | Proton-M |
| Türksat 4B | October 16, 2015 | Türksat | Proton-M |
| Türksat 5A | January 8, 2021 | Türksat | Falcon 9 Block 5 |
| Türksat 5B | December 19, 2021 | Türksat | Falcon 9 Block 5 |
 Türksat 6A | July 8, 2024 | Türksat | Falcon 9 Block 5 |