| Claudia Gadelha (inactive) | Claudinha | 7-5-0 | Brazil | Nov 7, 2020 |
| Magomed Gadzhiyasulov (inactive) | | 1-1-0 | Russia | Jan 11, 2025 |
| Justin Gaethje | The Highlight | 11-5-0 | United States | Jun 14, 2026 |
| Sheila Gaff (inactive) | The German Tank | 0-2-0 | Germany | Aug 3, 2013 |
| Muin Gafurov | Tajik | 2-3-0 | Tajikistan | Feb 7, 2026 |
| Mitch Gagnon (inactive) | | 4-4-0 | Canada | May 4, 2019 |
| Dave Galera (inactive) | Scarecrow | 0-1-0 | Unknown | Jan 4, 2014 |
| Mickey Gall | | 6-7-0 | United States | Nov 16, 2024 |
| Tom Gallicchio (inactive) | Da Tank | 0-1-0 | United States | Jul 7, 2017 |
| Joey Gambino (inactive) | The Raging Warrior | 0-2-0 | United States | Oct 13, 2012 |
| Manvel Gamburyan (inactive) | The Anvil | 6-8-0 (1 NC) | Armenia | Nov 19, 2016 |
| Mateusz Gamrot | Gamer | 9-5-0 | Poland | Aug 8, 2026 |
| Shamil Gamzatov (inactive) | | 1-1-0 | Russia | Oct 30, 2021 |
| Ryan Gandra | Problema | 3-0-0 | Brazil | Sep 19, 2026 |
| Ciryl Gane | Bon Gamin | 11-2-0 (1 NC) | France | Jun 14, 2026 |
| Sean Gannon (inactive) | The Cannon | 0-1-0 | United States | Oct 7, 2005 |
| Tommy Gantt | | 2-0-0 | United States | Sep 12, 2026 |
| Eduardo Garagorri (inactive) | | 1-2-0 | Unknown | Nov 7, 2020 |
| Cody Garbrandt | No Love | 10-8-0 | United States | Jul 11, 2026 |
| Alex Garcia (inactive) | The Dominican Nightmare | 5-5-0 | Dominican Republic | Oct 27, 2018 |
| Edgar Garcia (inactive) | | 0-4-0 | Mexico | Jan 2, 2016 |
| Elias Garcia (inactive) | | 0-2-0 | United States | Dec 1, 2018 |
| Fernie Garcia | | 0-4-0 | United States | Feb 10, 2024 |
| Leonard Garcia (inactive) | Bad Boy | 2-7-0 | Unknown | Apr 27, 2013 |
| Rafa Garcia | Gifted | 7-5-0 | United States | Sep 12, 2026 |
| Steve Garcia | Mean Machine | 8-3-0 | United States | Jun 14, 2026 |
| Ian Machado Garry | The Future | 10-2-0 | Ireland | Aug 15, 2026 |
| John Garza | Mowgli | 0-1-0 | United States | Jul 11, 2026 |
| Pablo Garza (inactive) | The Scarecrow | 3-3-0 | United States | Apr 6, 2013 |
| Azamat Gashimov (inactive) | | 0-2-0 | Russia | May 18, 2013 |
| Brian Gassaway (inactive) | | 0-1-0 | United States | Aug 20, 2005 |
| Kelvin Gastelum | | 14-11-0 (1 NC) | United States | Apr 11, 2026 |
| Willie Gates (inactive) | | 1-3-0 | United States | May 8, 2016 |
| Melissa Gatto | | 3-3-0 | Brazil | Apr 4, 2026 |
| Louis Gaudinot (inactive) | Goodnight | 1-3-0 (1 NC) | United States | Jan 3, 2015 |
| Ateba Gautier | The Storm | 5-1-0 | Cameroon | Oct 3, 2026 |
| Shamil Gaziev | | 4-3-0 | Russia | Aug 22, 2026 |
| Paul Georgieff (inactive) | | 0-1-0 | United States | Dec 8, 2007 |
| Brian Geraghty (inactive) | Duke | 0-1-0 | United States | Jun 23, 2007 |
| Karine Gevorgyan (inactive) | The Princess | 0-1-0 | Armenia | Dec 1, 2017 |
| Yanis Ghemmouri (inactive) | The Desert Warrior | 0-2-0 | France | Jun 29, 2024 |
| Darrel Gholar (inactive) | | 0-1-0 | United States | Jan 8, 1999 |
| Tiki Ghosn (inactive) | | 0-4-0 | United States | Apr 2, 2004 |
| Christos Giagos (inactive) | The Spartan | 6-8-0 | United States | Apr 6, 2024 |
| Joe Giannetti (inactive) | | 0-1-0 | United States | Jul 6, 2018 |
| James Giboo (inactive) | | 0-1-0 | United States | Jul 19, 2008 |
| Cody Gibson (inactive) | The Renegade | 3-8-0 | United States | Jul 25, 2026 |
| Lance Gibson (inactive) | Fearless | 1-1-0 | Unknown | Dec 16, 2000 |
| Thomas Gifford (inactive) | The Young Lion | 0-2-0 | United States | Oct 12, 2019 |
| Joseph Gigliotti (inactive) | Capo | 0-2-0 | United States | Dec 9, 2016 |
| Joey Gilbert (inactive) | | 0-1-0 | United States | May 4, 2001 |
| Trevin Giles (inactive) | | 7-7-0 | United States | Nov 2, 2024 |
| Gregor Gillespie | The Gift | 7-1-0 | United States | May 8, 2021 |
| Jason Gilliam (inactive) | | 0-2-0 | United States | Jul 7, 2007 |
| Micheal Gillmore (inactive) | The Gentleman | 0-2-0 | United States | Feb 26, 2022 |
| Bob Gilstrap (inactive) | | 0-1-0 | Unknown | May 15, 1998 |
| Max Gimenis | | 0-1-0 | Brazil | Nov 8, 2025 |
| He-Man Gipson (inactive) | | 0-1-0 | Unknown | Jul 14, 1995 |
| Ricky Glenn (inactive) | The Gladiator | 4-6-1 | United States | Aug 17, 2024 |
| Mark Godbeer (inactive) | The Hand Of | 2-2-0 | United Kingdom | Mar 17, 2018 |
| Loopy Godinez | | 9-6-0 | Mexico | Apr 11, 2026 |
| Jason Godsey (inactive) | | 0-2-0 | Unknown | Sep 24, 1999 |
| Allan Goes (inactive) | | 0-1-0 | Brazil | May 15, 1998 |
| Billy Ray Goff | | 1-3-0 | United States | Aug 8, 2026 |
| Hannah Goldy | 24K | 1-4-0 | United States | Sep 23, 2023 |
| Marcelo Golm (inactive) | | 1-3-0 | Brazil | Apr 20, 2019 |
| Denise Gomes | Dee | 7-2-0 | Brazil | Aug 29, 2026 |
| Joey Gomez (inactive) | KO King | 0-2-0 | United States | Sep 17, 2016 |
| Ulysses Gomez (inactive) | Useless | 0-2-0 | Unknown | Feb 16, 2013 |
| Takanori Gomi (inactive) | The Fireball Kid | 4-9-0 | Japan | Sep 22, 2017 |
| William Gomis | Jaguar | 5-2-0 | France | May 9, 2026 |
| Akihiro Gono (inactive) | | 1-2-0 | United States | Jan 31, 2009 |
| Gabriel Gonzaga (inactive) | Napao | 12-10-0 | Brazil | Apr 10, 2016 |
| Erick Gonzalez (inactive) | The Ghost Pepper | 0-3-0 | United States | Feb 25, 2023 |
| Jason Gonzalez (inactive) | Nicoya | 1-3-0 | United States | Apr 27, 2019 |
| Lewis Gonzalez (inactive) | Lethal | 0-1-0 | Unknown | Jun 27, 2015 |
| Pearl Gonzalez (inactive) | | 0-2-0 | United States | Oct 7, 2017 |
| Lyman Good (inactive) | Cyborg | 3-3-0 | United States | Jun 20, 2020 |
| Jared Gooden (inactive) | NiteTrain | 2-5-0 | United States | Oct 12, 2024 |
| Gary Goodridge (inactive) | Big Daddy | 4-4-0 | Canada | Mar 5, 1999 |
| Eddie Gordon (inactive) | Truck | 1-3-0 | United States | Jun 27, 2015 |
| Jared Gordon | Flash | 9-8-0 (1 NC) | United States | May 9, 2026 |
| Malcolm Gordon (inactive) | X | 2-5-0 | Canada | Jan 20, 2024 |
| Tresean Gore | Mr. Vicious | 4-4-0 | United States | Aug 15, 2026 |
| Alex Gorgees (inactive) | Hitman | 0-1-0 | Australia | Dec 1, 2018 |
| Themba Gorimbo | Mamba | 4-4-0 | Zimbabwe | May 2, 2026 |
| Tim Gorman (inactive) | The Psycho | 0-2-0 | United States | Nov 8, 2014 |
| Chase Gormley (inactive) | | 0-2-0 | United States | Mar 21, 2010 |
| Jonathan Goulet (inactive) | The Road Warrior | 4-5-0 | Canada | May 8, 2010 |
| Thibault Gouti (inactive) | GT | 1-5-0 | France | Oct 27, 2018 |
| Wilson Gouveia (inactive) | | 6-4-0 | Brazil | Dec 12, 2009 |
| Damian Grabowski (inactive) | The Polish Pitbull | 0-3-0 | Poland | Jul 22, 2017 |
| Kron Gracie (inactive) | | 1-3-0 | Brazil | Dec 7, 2024 |
| Renzo Gracie (inactive) | | 0-1-0 | Brazil | Apr 10, 2010 |
| Roger Gracie (inactive) | | 0-1-0 | Brazil | Jul 6, 2013 |
| Rolles Gracie (inactive) | | 0-1-0 | Brazil | Feb 6, 2010 |
| Royce Gracie (inactive) | | 8-1-1 | Brazil | May 27, 2006 |
| Bogdan Grad | The Unleashed | 2-2-0 | Romania | Aug 1, 2026 |
| Steven Graham (inactive) | | 1-1-0 | Unknown | May 30, 1997 |
| Miranda Granger (inactive) | Danger | 1-3-0 | United States | Aug 6, 2022 |
| Davey Grant | Dangerous | 9-7-0 | United Kingdom | Apr 25, 2026 |
| Dwight Grant (inactive) | The Body Snatcher | 3-5-0 | United States | Jul 16, 2022 |
| TJ Grant (inactive) | | 8-3-0 | Canada | May 25, 2013 |
| Alexa Grasso | | 10-5-1 | Mexico | Sep 12, 2026 |
| Tony Gravely (inactive) | | 4-4-0 | United States | Mar 11, 2023 |
| Michael Graves (inactive) | | 2-0-1 | United States | Jul 30, 2016 |
| Desmond Green (inactive) | The Predator | 4-3-0 | United States | May 18, 2019 |
| Gabe Green | Gifted | 3-3-0 | United States | May 17, 2025 |
| King Green | | 17-13-1 (1 NC) | United States | Oct 3, 2026 |
| Maurice Greene (inactive) | The Crochet Boss | 4-4-0 | United States | May 8, 2021 |
| Matt Grice (inactive) | The Real One | 2-5-0 | United States | Feb 23, 2013 |
| Forrest Griffin (inactive) | | 10-5-0 | United States | Jul 7, 2012 |
| Jordan Griffin (inactive) | Native Psycho | 1-4-0 | United States | Apr 10, 2021 |
| Max Griffin (inactive) | Pain | 8-11-0 | United States | Apr 25, 2026 |
| Tyson Griffin (inactive) | | 8-6-0 | United States | Oct 29, 2011 |
| Chad Griggs (inactive) | The Grave Digger | 0-2-0 | United States | Nov 17, 2012 |
| Charalampos Grigoriou (inactive) | Ferocious | 0-2-0 | Cyprus | Aug 10, 2024 |
| Maxim Grishin (inactive) | Maximus | 2-3-0 | Russia | Jun 3, 2023 |
| Josh Grispi (inactive) | The Fluke | 0-4-0 | United States | Feb 16, 2013 |
| Kendall Grove (inactive) | Da Spyder | 7-6-0 | United States | May 28, 2011 |
| Neil Grove (inactive) | Goliath | 0-1-0 | South Africa | Feb 21, 2009 |
| Chris Gruetzemacher (inactive) | Gritz | 3-4-0 | Unknown | Dec 4, 2021 |
| Vik Grujic (inactive) | The Spartan | 1-3-0 | Australia | May 9, 2015 |
| Mike Grundy (inactive) | | 1-3-0 | United Kingdom | Mar 19, 2022 |
| Wang Guan (inactive) | The Dongbei Tiger | 1-0-0 | China | Nov 25, 2017 |
| Nandor Guelmino (inactive) | The Hun | 0-1-0 | Austria | Sep 21, 2013 |
| Shannon Gugerty (inactive) | | 2-3-0 | United States | Mar 21, 2010 |
| Noah Gugnon | Guns | 1-0-0 | France | Aug 1, 2026 |
| Clay Guida (inactive) | The Carpenter | 18-19-0 | United States | Dec 7, 2024 |
| Melvin Guillard (inactive) | The Young Assassin | 12-9-0 (1 NC) | United States | Mar 8, 2014 |
| Leonardo Guimaraes (inactive) | Leleco | 0-2-0 | Unknown | Sep 17, 2016 |
| Marcelo Guimaraes (inactive) | Magrao | 2-2-0 | Brazil | Mar 5, 2016 |
| Brad Gumm (inactive) | | 0-1-1 | Unknown | Sep 22, 2000 |
| John Gunderson (inactive) | Quick Guns | 1-2-0 | United States | Sep 15, 2010 |
| John Gunther (inactive) | The Machine | 1-1-0 | United States | Nov 10, 2018 |
| Fabio Gurgel (inactive) | | 0-1-0 | Unknown | Sep 20, 1996 |
| Jorge Gurgel (inactive) | | 3-4-0 | Brazil | Nov 15, 2008 |
| Luis Gurule | Grim | 1-4-0 | United States | May 30, 2026 |
| Bogdan Guskov | Hitman | 4-2-1 | Uzbekistan | Jul 25, 2026 |
| Andre Gusmao (inactive) | | 0-2-0 | Brazil | May 23, 2009 |
| Alexander Gustafsson (inactive) | The Mauler | 10-8-0 | Sweden | Jul 23, 2022 |
| Andreas Gustafsson (inactive) | Bane | 1-1-0 | Sweden | Sep 6, 2025 |
| Chris Gutierrez | El Guapo | 10-4-1 | United States | Oct 4, 2025 |
| Horacio Gutierrez (inactive) | The Punisher | 0-2-0 | Mexico | Aug 6, 2016 |
| Mike Guymon (inactive) | The Joker | 1-3-0 | United States | Jan 22, 2011 |