| Fighter | Record | Last Bout |
|---|---|---|
| George Sullivan | 17-7-0 (1 NC) | 2018-08-25 |
| Georges St-Pierre | 26-2-0 | 2017-11-04 |
| Gerald Harris | 23-5-0 | 2010-11-20 |
| Gerald Strebendt | 9-7-0 | 2003-09-26 |
| Geraldo de Freitas | 12-6-0 | 2020-11-14 |
| Germaine de Randamie | 10-5-0 | 2024-04-06 |
| Gerry Harris | 1-4-0 | 1995-09-08 |
| Geza Kalman | 4-9-0 | 1996-07-12 |
| Gian Villante | 17-14-0 | 2021-11-06 |
| Gideon Ray | 17-15-1 | 2006-11-11 |
| Gil Castillo | 8-5-0 | 2002-11-22 |
| Gilbert Aldana | 6-2-0 | 2006-07-08 |
| Gilbert Melendez | 22-8-0 | 2019-07-06 |
| Gilbert Smith | 12-6-0 | 2013-04-13 |
| Gilbert Yvel | 39-16-1 (1 NC) | 2010-10-23 |
| Gina Mazany | 7-6-0 | 2022-04-30 |
| Glaico Franca Moreira | 15-5-0 | 2016-09-24 |
| Gleison Tibau | 33-14-0 | 2018-06-01 |
| Gloria de Paula | 6-5-0 | 2022-06-18 |
| Glover Teixeira | 33-9-0 | 2023-01-21 |
| Godofredo Pepey | 13-6-0 | 2018-01-27 |
| Gokhan Saki | 1-2-0 | 2018-07-07 |
| Goran Reljic | 15-8-0 | 2010-11-13 |
| Gray Maynard | 13-7-1 (1 NC) | 2018-10-06 |
| Greg Hardy | 7-5-0 (1 NC) | 2022-03-05 |
| Greg Soto | 9-4-0 | 2011-01-01 |
| Greg Stott | 0-1-0 | 1997-10-17 |
| Gregor Gillespie | 14-1-0 | 2021-05-08 |
| Grigory Popov | 13-3-0 | 2019-11-09 |
| Guangyou Ning | 5-4-1 | 2016-11-26 |
| Guido Cannetti | 10-8-0 | 2023-03-11 |
| Guilherme Vasconcelos | 9-4-0 | 2014-07-05 |
| Gustavo Lopez | 12-6-1 | 2021-09-18 |
| Guto Inocente | 7-4-0 | 2014-11-07 |
| Guy Mezger | 30-14-2 | 1999-03-05 |
| Hannah Goldy | 6-4-0 | 2023-09-23 |
| He-Man Gipson | 1-2-0 | 1995-07-14 |
| Horacio Gutierrez | 4-3-0 | 2016-08-06 |
| Hyun Gyu Lim | 13-7-1 | 2017-09-22 |
| James Giboo | 13-5-0 | 2008-07-19 |
| Jason Gilliam | 14-9-0 | 2007-07-07 |
| Jason Godsey | 16-16-0 | 1999-09-24 |
| Jason Gonzalez | 11-5-0 | 2019-04-27 |
| Joe Giannetti | 6-1-0 | 2018-07-06 |
| Joey Gambino | 9-2-0 | 2012-10-13 |
| Joey Gilbert | 2-3-0 | 2001-05-04 |
| Joey Gomez | 6-2-0 | 2016-09-17 |
| John Gunderson | 35-16-2 | 2010-09-15 |
| John Gunther | 5-1-0 | 2018-11-10 |
| Jonathan Goulet | 23-12-0 (1 NC) | 2010-05-08 |