The fastest knockout in UFC welterweight history is Jorge Masvidal vs Ben Askren, at 5 seconds, at UFC 239: Jones vs. Santos on 6 July 2019.
| # | Time | Bout | Result | Ended | Date | Event |
|---|---|---|---|---|---|---|
| 1 | 0:05 | Jorge Masvidal vs Ben Askren | Jorge Masvidal · KO/TKO | R1 0:05 | 2019-07-06 | UFC 239: Jones vs. Santos |
| 2 | 0:06 | Duane Ludwig vs Jonathan Goulet | Duane Ludwig · KO/TKO | R1 0:06 | 2006-01-16 | UFC Fight Night 3 |
| 3 | 0:08 | Seth Baczynski vs Leon Edwards | Leon Edwards · KO/TKO | R1 0:08 | 2015-04-11 | UFC Fight Night: Gonzaga vs Cro Cop 2 |
| 4 | 0:12 | Jon Fitch vs Johny Hendricks | Johny Hendricks · KO/TKO | R1 0:12 | 2011-12-30 | UFC 141: Lesnar vs Overeem |
| 5 | 0:13 | Anthony Johnson vs Chad Reiner | Anthony Johnson · KO/TKO | R1 0:13 | 2007-06-12 | UFC Fight Night: Stout vs Fisher |
| 6 | 0:14 | Bryan Battle vs Gabe Green | Bryan Battle · KO/TKO | R1 0:14 | 2023-05-13 | UFC Fight Night: Rozenstruik vs. Almeida |
| 7 | 0:15 | Song Kenan vs Bobby Nash | Song Kenan · KO/TKO | R1 0:15 | 2017-11-25 | UFC Fight Night: Bisping vs. Gastelum |
| 8 | 0:15 | Matthew Semelsberger vs Martin Sano | Matthew Semelsberger · KO/TKO | R1 0:15 | 2021-09-25 | UFC 266: Volkanovski vs. Ortega |
| 9 | 0:16 | Matthew Semelsberger vs Jason Witt | Matthew Semelsberger · KO/TKO | R1 0:16 | 2021-03-13 | UFC Fight Night: Edwards vs. Muhammad |
| 10 | 0:21 | Joshua Burkman vs Sammy Morgan | Joshua Burkman · KO/TKO | R1 0:21 | 2005-11-05 | The Ultimate Fighter: Team Hughes vs. Team Franklin Finale |
| 11 | 0:21 | Matt Hughes vs BJ Penn | BJ Penn · KO/TKO | R1 0:21 | 2010-11-20 | UFC 123: Rampage vs Machida |
| 12 | 0:23 | Leon Shahbazyan vs Levan Chokheligraded call | Levan Chokheli · KO/TKO | R1 0:23 | 2026-06-20 | UFC Fight Night: Kape vs. Horiguchi |
| 13 | 0:27 | Alex Morono vs Khaos Williams | Khaos Williams · KO/TKO | R1 0:27 | 2020-02-08 | UFC 247: Jones vs. Reyes |
| 14 | 0:29 | Johny Hendricks vs Amir Sadollah | Johny Hendricks · KO/TKO | R1 0:29 | 2009-08-08 | UFC 101: Declaration |
| 15 | 0:29 | Matt Brown vs Mike Pyle | Matt Brown · KO/TKO | R1 0:29 | 2013-08-17 | UFC Fight Night: Shogun vs Sonnen |
| 16 | 0:30 | Sam Stout vs KJ Noons | KJ Noons · KO/TKO | R1 0:30 | 2014-04-16 | UFC Fight Night: Bisping vs Kennedy |
| 17 | 0:30 | Vernon Ramos Ho vs Alvaro Herrera Mendoza | Alvaro Herrera Mendoza · KO/TKO | R1 0:30 | 2015-11-21 | UFC Fight Night: Magny vs Gastelum |
| 18 | 0:30 | Abdul Razak Alhassan vs Khaos Williams | Khaos Williams · KO/TKO | R1 0:30 | 2020-11-14 | UFC Fight Night: Felder vs. Dos Anjos |
| 19 | 0:30 | Uros Medic vs Daniel Rodriguezgraded call | Uros Medic · KO/TKO | R1 0:30 | 2026-08-01 | UFC Fight Night: Medic vs. Rodriguez |
| 20 | 0:31 | Punahele Soriano vs Uros Medic | Punahele Soriano · KO/TKO | R1 0:31 | 2025-01-11 | UFC Fight Night: Dern vs. Ribas 2 |
| 21 | 0:32 | Themba Gorimbo vs Pete Rodriguez | Themba Gorimbo · KO/TKO | R1 0:32 | 2024-02-03 | UFC Fight Night: Dolidze vs. Imavov |
| 22 | 0:33 | Chris Lytle vs Kyle Bradley | Chris Lytle · KO/TKO | R1 0:33 | 2008-02-02 | UFC 81: Breaking Point |
| 23 | 0:33 | Mike Swick vs Jonathan Goulet | Mike Swick · KO/TKO | R1 0:33 | 2008-12-10 | UFC Fight Night - Fight for the Troops |
| 24 | 0:36 | Tyron Woodley vs Jay Hieron | Tyron Woodley · KO/TKO | R1 0:36 | 2013-02-02 | UFC 156: Aldo vs Edgar |
| 25 | 0:38 | Robbie Lawler vs Niko Price | Robbie Lawler · KO/TKO | R1 0:38 | 2023-07-08 | UFC 290: Volkanovski vs. Rodriguez |
| 26 | 0:39 | Alex Oliveira vs Carlo Pedersoli Jr. | Alex Oliveira · KO/TKO | R1 0:39 | 2018-09-22 | UFC Fight Night: Marreta vs. Anders |
| 27 | 0:40 | Erick Silva vs Luis Ramos | Erick Silva · KO/TKO | R1 0:40 | 2011-08-27 | UFC 134: Silva vs Okami |
| 28 | 0:40 | Chris Cope vs Che Mills | Che Mills · KO/TKO | R1 0:40 | 2011-11-05 | UFC 138: Leben vs Munoz |
| 29 | 0:40 | Conor McGregor vs Donald Cerrone | Conor McGregor · KO/TKO | R1 0:40 | 2020-01-18 | UFC 246: McGregor vs. Cowboy |
| 30 | 0:41 | Anthony Johnson vs Yoshiyuki Yoshida | Anthony Johnson · KO/TKO | R1 0:41 | 2009-10-24 | UFC 104: Machida vs Shogun |
| 31 | 0:42 | Paulo Thiago vs Siyar Bahadurzada | Siyar Bahadurzada · KO/TKO | R1 0:42 | 2012-04-14 | UFC on FUEL TV: Gustafsson vs Silva |
| 32 | 0:42 | Muslim Salikhov vs Carlos Leal | Muslim Salikhov · KO/TKO | R1 0:42 | 2025-07-26 | UFC Fight Night: Whittaker vs. De Ridder |
| 33 | 0:43 | Ben Wall vs Alex Garcia | Alex Garcia · KO/TKO | R1 0:43 | 2013-12-06 | UFC Fight Night: Hunt vs Bigfoot |
| 34 | 0:43 | Abdul Razak Alhassan vs Niko Price | Abdul Razak Alhassan · KO/TKO | R1 0:43 | 2018-09-08 | UFC 228: Woodley vs. Till |
| 35 | 0:44 | Bryan Battle vs Takashi Sato | Bryan Battle · KO/TKO | R1 0:44 | 2022-08-06 | UFC Fight Night: Santos vs. Hill |
| 36 | 0:45 | Kyle Noke vs Charlie Brenneman | Kyle Noke · KO/TKO | R1 0:45 | 2012-09-22 | UFC 152: Jones vs Belfort |
| 37 | 0:46 | Johny Hendricks vs Martin Kampmann | Johny Hendricks · KO/TKO | R1 0:46 | 2012-11-17 | UFC 154: St-Pierre vs Condit |
| 38 | 0:47 | Dong Hyun Kim vs Demian Maia | Demian Maia · KO/TKO | R1 0:47 | 2012-07-07 | UFC 148: Silva vs Sonnen 2 |
| 39 | 0:48 | Takashi Sato vs Jason Witt | Takashi Sato · KO/TKO | R1 0:48 | 2020-06-27 | UFC Fight Night: Poirier vs. Hooker |
| 40 | 0:51 | Anthony Johnson vs Tommy Speer | Anthony Johnson · KO/TKO | R1 0:51 | 2008-04-02 | UFC Fight Night: Florian vs Lauzon |
| 41 | 0:51 | Matthew Semelsberger vs Charles Radtke | Charles Radtke · KO/TKO | R1 0:51 | 2024-11-09 | UFC Fight Night: Magny vs. Prates |
| 42 | 0:52 | Erick Silva vs Takenori Sato | Erick Silva · KO/TKO | R1 0:52 | 2014-02-15 | UFC Fight Night: Machida vs Mousasi |
| 43 | 0:53 | Jake Shields vs Jake Ellenberger | Jake Ellenberger · KO/TKO | R1 0:53 | 2011-09-17 | UFC Fight Night: Shields vs Ellenberger |
| 44 | 0:53 | Charlie Ward vs Abdul Razak Alhassan | Abdul Razak Alhassan · KO/TKO | R1 0:53 | 2016-11-19 | — |
| 45 | 0:54 | Erick Montano vs Max Griffin | Max Griffin · KO/TKO | R1 0:54 | 2016-11-05 | UFC Fight Night: Dos Anjos vs. Ferguson |
| 46 | 0:54 | Andreas Gustafsson vs Rinat Fakhretdinov | Rinat Fakhretdinov · KO/TKO | R1 0:54 | 2025-09-06 | UFC Fight Night: Imavov vs. Borralho |
| 47 | 0:59 | Nordine Taleb vs Danny Roberts | Nordine Taleb · KO/TKO | R1 0:59 | 2017-12-16 | UFC Fight Night: Lawler vs. Dos Anjos |
| 48 | 0:59 | Anthony Ivy vs Christian Aguilera | Christian Aguilera · KO/TKO | R1 0:59 | 2020-06-13 | UFC Fight Night: Eye vs. Calvillo |
| 49 | 1:00 | Vicente Luque vs Hector Urbina | Vicente Luque · KO/TKO | R1 1:00 | 2016-09-24 | UFC Fight Night: Cyborg vs. Lansberg |
| 50 | 1:01 | Tyron Woodley vs Dong Hyun Kim | Tyron Woodley · KO/TKO | R1 1:01 | 2014-08-23 | — |
| 51 | 1:03 | Albert Tumenov vs Matt Dwyer | Albert Tumenov · KO/TKO | R1 1:03 | 2014-10-04 | — |
| 52 | 1:03 | Uros Medic vs Gilbert Urbina | Uros Medic · KO/TKO | R1 1:03 | 2025-08-09 | UFC Fight Night: Dolidze vs. Hernandez |
| 53 | 1:03 | Muslim Salikhov vs Uros Medic | Uros Medic · KO/TKO | R1 1:03 | 2025-11-08 | UFC Fight Night: Bonfim vs. Brown |
| 54 | 1:04 | Marcus Davis vs Jess Liaudin | Marcus Davis · KO/TKO | R1 1:04 | 2008-01-19 | UFC 80: Rapid Fire |
| 55 | 1:07 | Brian Foster vs Forrest Petz | Brian Foster · KO/TKO | R1 1:07 | 2010-09-15 | UFC Fight Night: Marquardt vs Palhares |
| 56 | 1:08 | Niklas Stolze vs Jared Gooden | Jared Gooden · KO/TKO | R1 1:08 | 2021-07-31 | UFC Fight Night: Hall vs. Strickland |
| 57 | 1:09 | Dan Hardy vs Rory Markham | Dan Hardy · KO/TKO | R1 1:09 | 2009-02-21 | UFC 95: Sanchez vs Stevenson |
| 58 | 1:09 | Conor McGregor vs Max Hollowaygraded call | Max Holloway · KO/TKO | R1 1:09 | 2026-07-11 | UFC 329: McGregor vs. Holloway 2 |
| 59 | 1:12 | Mike Pyle vs Jordan Mein | Jordan Mein · KO/TKO | R1 1:12 | 2014-08-23 | — |
| 60 | 1:13 | Preston Parsons vs Jacobe Smith | Jacobe Smith · KO/TKO | R1 1:13 | 2025-01-11 | UFC Fight Night: Dern vs. Ribas 2 |
| 61 | 1:15 | Marcus Davis vs Jason Tan | Marcus Davis · KO/TKO | R1 1:15 | 2007-06-16 | UFC 72: Victory |
| 62 | 1:15 | Elizeu Zaleski dos Santos vs Zachary Scroggin | Elizeu Zaleski dos Santos · KO/TKO | R1 1:15 | 2024-11-09 | UFC Fight Night: Magny vs. Prates |
| 63 | 1:18 | Hyun Gyu Lim vs Takenori Sato | Hyun Gyu Lim · KO/TKO | R1 1:18 | 2014-09-20 | UFC Fight Night: Hunt vs Nelson |
| 64 | 1:18 | Tim Means vs Ricky Rainey | Tim Means · KO/TKO | R1 1:18 | 2018-11-30 | The Ultimate Fighter: Heavy Hitters Finale |
| 65 | 1:19 | Vicente Luque vs Belal Muhammad | Vicente Luque · KO/TKO | R1 1:19 | 2016-11-12 | UFC 205: Alvarez vs McGregor |
| 66 | 1:19 | Mike Perry vs Alex Reyes | Mike Perry · KO/TKO | R1 1:19 | 2017-09-16 | UFC Fight Night: Rockhold vs. Branch |
| 67 | 1:19 | Geoff Neal vs Uros Medicgraded call | Uros Medic · KO/TKO | R1 1:19 | 2026-02-21 | UFC Fight Night: Strickland vs. Hernandez |
| 68 | 1:20 | Santiago Ponzinibbio vs Wendell Oliveira Marques | Santiago Ponzinibbio · KO/TKO | R1 1:20 | 2014-09-13 | UFC Fight Night: Bigfoot vs Arlovski |
| 69 | 1:22 | Ricardo Funch vs Mike Pyle | Mike Pyle · KO/TKO | R1 1:22 | 2012-01-14 | UFC 142: Aldo vs Mendes |
| 70 | 1:22 | Gunnar Nelson vs Santiago Ponzinibbio | Santiago Ponzinibbio · KO/TKO | R1 1:22 | 2017-07-16 | UFC Fight Night: Nelson vs. Ponzinibbio |
| 71 | 1:23 | Justin Edwards vs Brandon Thatch | Brandon Thatch · KO/TKO | R1 1:23 | 2013-08-28 | UFC Fight Night: Condit vs Kampmann 2 |
| 72 | 1:24 | Nick Diaz vs Koji Oishi | Nick Diaz · KO/TKO | R1 1:24 | 2005-06-04 | UFC 53: Heavy Hitters |
| 73 | 1:25 | Josh Koscheck vs Frank Trigg | Josh Koscheck · KO/TKO | R1 1:25 | 2009-09-19 | UFC 103: Franklin vs Belfort |
| 74 | 1:25 | Li Jingliang vs Dhiego Lima | Li Jingliang · KO/TKO | R1 1:25 | 2015-05-16 | UFC Fight Night: Edgar vs Faber |
| 75 | 1:29 | Robbie Lawler vs Tiki Ghosn | Robbie Lawler · KO/TKO | R1 1:29 | 2002-11-22 | UFC 40: Vendetta |
| 76 | 1:30 | Geoff Neal vs Mike Perry | Geoff Neal · KO/TKO | R1 1:30 | 2019-12-14 | UFC 245: Usman vs. Covington |
| 77 | 1:30 | Khaos Williams vs Carlston Harris | Khaos Williams · KO/TKO | R1 1:30 | 2024-05-18 | UFC Fight Night: Barboza vs. Murphy |
| 78 | 1:30 | Geoff Neal vs Rafael Dos Anjos | Geoff Neal · KO/TKO | R1 1:30 | 2024-10-26 | UFC 308: Topuria vs. Holloway |
| 79 | 1:32 | Matt Brown vs Pete Sell | Matt Brown · KO/TKO | R1 1:32 | 2009-03-07 | UFC 96: Jackson vs Jardine |
| 80 | 1:32 | Lyman Good vs Ben Saunders | Lyman Good · KO/TKO | R1 1:32 | 2018-11-03 | UFC 230: Cormier vs. Lewis |
| 81 | 1:33 | Mike Jackson vs Pete Rodriguez | Pete Rodriguez · KO/TKO | R1 1:33 | 2022-10-15 | UFC Fight Night: Grasso vs. Araujo |
| 82 | 1:34 | DaMarques Johnson vs Clay Harvison | DaMarques Johnson · KO/TKO | R1 1:34 | 2011-11-12 | UFC on FOX: Velasquez vs Dos Santos |
| 83 | 1:34 | Court McGee vs Jeremiah Wells | Jeremiah Wells · KO/TKO | R1 1:34 | 2022-06-18 | UFC Fight Night: Kattar vs. Emmett |
| 84 | 1:35 | Johny Hendricks vs TJ Waldburger | Johny Hendricks · KO/TKO | R1 1:35 | 2011-03-26 | UFC Fight Night: Nogueira vs Davis |
| 85 | 1:36 | Viscardi Andrade vs Bristol Marunde | Viscardi Andrade · KO/TKO | R1 1:36 | 2013-08-03 | UFC 163: Aldo vs Jung |
| 86 | 1:37 | Rory Markham vs Brodie Farber | Rory Markham · KO/TKO | R1 1:37 | 2008-07-19 | UFC: Silva vs Irvin |
| 87 | 1:37 | Chad Laprise vs Dhiego Lima | Dhiego Lima · KO/TKO | R1 1:37 | 2018-12-08 | UFC 231: Holloway vs. Ortega |
| 88 | 1:40 | Alex Karalexis vs Josh Rafferty | Alex Karalexis · KO/TKO | R1 1:40 | 2005-04-09 | The Ultimate Fighter: Team Couture vs. Team Liddell Finale |
| 89 | 1:42 | Georges St-Pierre vs Jay Hieron | Georges St-Pierre · KO/TKO | R1 1:42 | 2004-06-19 | UFC 48: Payback |
| 90 | 1:42 | Nikolay Veretennikov vs Niko Pricegraded call | Nikolay Veretennikov · KO/TKO | R1 1:42 | 2026-02-07 | UFC Fight Night: Bautista vs. Oliveira |
| 91 | 1:44 | Alan Jouban vs Niko Price | Niko Price · KO/TKO | R1 1:44 | 2017-08-05 | UFC Fight Night: Pettis vs. Moreno |
| 92 | 1:44 | Niko Price vs James Vick | Niko Price · KO/TKO | R1 1:44 | 2019-10-12 | UFC Fight Night: Joanna vs. Waterson |
| 93 | 1:45 | Diego Sanchez vs Joe Riggs | Diego Sanchez · KO/TKO | R1 1:45 | 2006-12-13 | UFC Fight Night: Sanchez vs Riggs |
| 94 | 1:45 | Luke Cummo vs Edilberto de Oliveira | Luke Cummo · KO/TKO | R1 1:45 | 2007-09-19 | UFC Fight Night: Thomas vs Florian |
| 95 | 1:46 | Matt Brown vs Jake Ellenberger | Jake Ellenberger · KO/TKO | R1 1:46 | 2016-07-30 | UFC 201: Lawler vs. Woodley |
| 96 | 1:47 | Karo Parisyan vs Dennis Hallman | Dennis Hallman · KO/TKO | R1 1:47 | 2010-11-20 | UFC 123: Rampage vs Machida |
| 97 | 1:47 | Danny Roberts vs Michel Pereira | Michel Pereira · KO/TKO | R1 1:47 | 2019-05-18 | UFC Fight Night: Dos Anjos vs. Lee |
| 98 | 1:48 | Nate Marquardt vs Hector Lombard | Hector Lombard · KO/TKO | R1 1:48 | 2013-10-19 | UFC 166: Velasquez vs Dos Santos 3 |
| 99 | 1:49 | Ben Saunders vs Brandon Wolff | Ben Saunders · KO/TKO | R1 1:49 | 2008-12-10 | UFC Fight Night - Fight for the Troops |
| 100 | 1:49 | Oban Elliott vs Michael Oliveiragraded call | Michael Oliveira · KO/TKO | R1 1:49 | 2026-08-01 | UFC Fight Night: Medic vs. Rodriguez |