| Eugenio Tadeu (inactive) | | 0-1-0 | Unknown | Mar 13, 1998 |
| Junior Tafa | The Juggernaut | 3-6-0 | Australia | Jun 6, 2026 |
| Justin Tafa (inactive) | Bad Man | 4-5-0 (1 NC) | New Zealand | Feb 8, 2025 |
| Khalid Taha (inactive) | The Warrior | 1-4-0 (1 NC) | Germany | Sep 3, 2022 |
| Tatsuro Taira | The Best | 8-2-0 | Japan | May 9, 2026 |
| Mairbek Taisumov (inactive) | Beckan | 7-2-0 | Russia | Sep 7, 2019 |
| Yoshiki Takahashi (inactive) | Kazuo | 1-0-0 | Japan | Feb 7, 1997 |
| Daiju Takase (inactive) | | 0-3-0 | Japan | Dec 16, 2000 |
| Oleg Taktarov (inactive) | The Russian Bear | 6-2-1 | United States | Dec 16, 1995 |
| Payton Talbott | | 6-1-0 | United States | Oct 3, 2026 |
| Nordine Taleb (inactive) | | 7-5-0 | France | Sep 7, 2019 |
| Issei Tamura (inactive) | | 1-2-0 | Japan | Mar 16, 2013 |
| Jason Tan (inactive) | | 0-2-0 | United Kingdom | May 24, 2008 |
| Michinori Tanaka (inactive) | | 2-3-0 | Japan | Feb 4, 2017 |
| Evan Tanner (inactive) | | 11-6-0 | United States | Jun 21, 2008 |
| Otari Tanzilovi | | 0-1-0 | Georgia | Jun 20, 2026 |
| Regina Tarin | Kill Bill | 2-0-0 | Unknown | Sep 12, 2026 |
| Miesha Tate | Cupcake | 7-7-0 | United States | May 3, 2025 |
| Brad Tavares | | 16-12-0 | United States | Mar 14, 2026 |
| Thiago Tavares (inactive) | | 10-7-1 | Brazil | Jul 8, 2016 |
| Ramon Taveras | The Savage | 1-2-0 | United States | Sep 27, 2025 |
| Danielle Taylor (inactive) | Dynamite | 2-3-0 | United States | Aug 4, 2018 |
| Jesse Taylor (inactive) | JT Money | 1-1-0 | United States | Jul 7, 2017 |
| Paul Taylor (inactive) | Relentless | 4-5-0 | United Kingdom | Feb 5, 2011 |
| Glover Teixeira (inactive) | | 16-7-0 | Brazil | Jan 21, 2023 |
| John Teixeira (inactive) | Macapa | 0-1-0 | Brazil | Jun 23, 2012 |
| Tallison Teixeira | Xicao | 2-2-0 | Brazil | May 30, 2026 |
| Tra Telligman (inactive) | Trauma | 1-4-0 | United States | Aug 20, 2005 |
| Ramazan Temirov | Temurlan | 3-0-0 | Uzbekistan | Jul 25, 2026 |
| David Terrell (inactive) | The Soul Assassin | 2-1-0 | United States | Apr 15, 2006 |
| Daniel Teymur (inactive) | Kid Dynamite | 1-4-0 | Sweden | Dec 14, 2019 |
| David Teymur | | 5-1-0 | Sweden | Feb 2, 2019 |
| Motonobu Tezuka (inactive) | | 0-2-0 | Unknown | Feb 16, 2013 |
| Jason Thacker (inactive) | | 0-1-0 | Canada | Apr 9, 2005 |
| Alexia Thainara | Burguesinha | 4-0-0 | Brazil | Aug 8, 2026 |
| Brandon Thatch (inactive) | Rukus | 2-4-0 | United States | Dec 30, 2016 |
| Elias Theodorou (inactive) | The Spartan | 8-3-0 | Canada | May 4, 2019 |
| Paulo Thiago (inactive) | | 5-8-0 | Brazil | Sep 13, 2014 |
| Colby Thicknesse | Slickness | 2-1-0 | Australia | May 2, 2026 |
| Din Thomas (inactive) | Dinyero | 5-4-0 | United States | Apr 2, 2008 |
| Ryan Thomas (inactive) | The Tank Engine | 0-2-0 | United States | Nov 15, 2008 |
| Nick Thompson (inactive) | The Goat | 1-1-0 | United States | Apr 15, 2006 |
| Oli Thompson (inactive) | | 0-2-0 | United Kingdom | Aug 4, 2012 |
| Stephen Thompson | Wonderboy | 12-9-1 | United States | Jul 12, 2025 |
| Isaac Thomson | | 0-1-0 | Australia | Dec 13, 2025 |
| Josh Thomson (inactive) | The Punk | 3-4-0 | United States | Jul 15, 2015 |
| Simeon Thoresen (inactive) | The Grin | 1-2-0 | Norway | Jan 26, 2013 |
| Gleison Tibau (inactive) | | 16-12-0 | Brazil | Jun 1, 2018 |
| Chris Tickle (inactive) | BadBoy | 0-1-0 | United States | Jun 1, 2012 |
| Nolan Ticman (inactive) | | 0-2-0 | United States | May 16, 2015 |
| Zhang Tiequan (inactive) | The Wolf | 1-3-0 | Unknown | Nov 10, 2012 |
| Darren Till (inactive) | The Gorilla | 6-5-1 | United Kingdom | Dec 10, 2022 |
| Denis Tiuliulin | | 1-5-0 | Russia | Aug 3, 2024 |
| Rafael Tobias | Bipolar | 0-2-0 | Brazil | Aug 15, 2026 |
| Dusko Todorovic | Thunder | 4-7-0 | Montenegro | Aug 1, 2026 |
| Tuco Tokkos (inactive) | | 1-3-0 | United Kingdom | May 16, 2026 |
| Kazuki Tokudome (inactive) | | 1-3-0 | Unknown | Sep 20, 2014 |
| Puja Tomar | Cyclone | 1-1-0 | India | Mar 22, 2025 |
| Carls John De Tomas (inactive) | | 0-2-0 | Unknown | Dec 9, 2017 |
| Tyler Toner (inactive) | | 0-1-0 | United States | Dec 4, 2010 |
| James Toney (inactive) | Lights Out | 0-1-0 | United States | Aug 28, 2010 |
| Aleksandre Topuria | El Conquistador | 2-0-0 | Germany | Nov 22, 2025 |
| Ilia Topuria | El Matador | 9-1-0 | Germany | Jun 14, 2026 |
| Mike de la Torre (inactive) | El Cucuy | 2-4-0 (1 NC) | United States | Apr 8, 2017 |
| Alex Torres (inactive) | Rolo | 0-1-0 | Colombia | Feb 28, 2015 |
| Anthony Torres (inactive) | The Crush | 1-1-0 | United States | Sep 8, 2007 |
| Jose Torres (inactive) | Shorty | 1-1-0 | United States | Aug 4, 2018 |
| Manuel Torres | El Loco | 5-2-0 | Mexico | Jun 27, 2026 |
| Miguel Torres (inactive) | | 2-2-0 | United States | Apr 21, 2012 |
| Ronys Torres (inactive) | | 0-2-0 | Brazil | Mar 31, 2010 |
| Salim Touahri (inactive) | Grizzly | 0-3-0 | Poland | Aug 3, 2019 |
| Dequan Townsend (inactive) | The Tarantula | 0-4-0 | United States | Oct 3, 2020 |
| Roberto Traven (inactive) | Spider | 1-1-0 | Brazil | Nov 2, 2001 |
| Francisco Trevino (inactive) | Sitkayan | 1-2-0 | United States | Oct 3, 2015 |
| Frank Trigg (inactive) | Twinkle Toes | 2-5-0 | United States | Feb 6, 2010 |
| Francisco Trinaldo (inactive) | Massaranduba | 18-8-0 | Brazil | Oct 1, 2022 |
| Michael Trizano (inactive) | The Lone Wolf | 4-3-0 | United States | Nov 12, 2022 |
| Antonio Trocoli (inactive) | Malvado | 0-4-0 | Brazil | Mar 21, 2026 |
| Tor Troeng (inactive) | The Hammer | 1-3-0 | Sweden | Oct 4, 2014 |
| Abel Trujillo (inactive) | Killa | 6-4-0 (1 NC) | United States | Dec 16, 2017 |
| Arman Tsarukyan | Ahalkalakets | 11-2-0 | Georgia | Sep 19, 2026 |
| Rei Tsuruya | | 3-1-0 | Japan | Aug 29, 2026 |
| Magomed Tuchalov | Tiger | 1-0-0 | Russia | Jul 25, 2026 |
| Chris Tuchscherer (inactive) | The Crowbar | 1-3-0 | Unknown | Feb 26, 2011 |
| Jon Tuck (inactive) | Super Saiyan | 4-5-0 | United States | Aug 25, 2018 |
| Gavin Tucker (inactive) | Guv'nor | 4-3-0 | Canada | Aug 5, 2023 |
| Jumabieke Tuerxun (inactive) | The Wild Wolf | 0-3-0 | Unknown | Nov 7, 2014 |
| Tai Tuivasa | Bam Bam | 8-11-0 | Australia | Sep 19, 2026 |
| Zubaira Tukhugov (inactive) | Warrior | 5-3-1 | Russia | Feb 11, 2023 |
| Marco Tulio | Matuto | 2-2-0 | Brazil | May 9, 2026 |
| Nyamjargal Tumendemberel | Art of Knockout | 1-1-0 | Mongolia | Mar 7, 2026 |
| Albert Tumenov (inactive) | Einstein | 5-3-0 | Russia | Oct 8, 2016 |
| Ricky Turcios | | 2-4-0 | United States | Mar 7, 2026 |
| Anton Turkalj | The Pleasure Man | 0-4-0 | Sweden | Mar 30, 2024 |
| Wellington Turman | The Prodigy | 3-6-0 | Brazil | Dec 2, 2023 |
| Courtney Turner (inactive) | | 0-1-0 | Unknown | Mar 13, 1998 |
| Jalin Turner | The Tarantula | 9-6-0 | United States | Aug 15, 2026 |
| Marcin Tybura | Tybur | 14-11-0 | Poland | Aug 1, 2026 |