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Gunnar Lúðvík Nelson (born 28 July 1988) is an Icelandic professional mixed martial artist, currently competing in the Welterweight division of the Ultimate Fighting Championship. He is a black belt in Brazilian Jiu-Jitsu, which was awarded by Renzo Gracie after impressive results at the 2009 IBJJF Pan-Ams and the 2009 ADCC Submission Wrestling World Championship. Nelson is a member of Mjölnir MMA in Iceland, and SBG Ireland.
| 26 matches | 19 wins | 6 losses |
| By knockout | 4 | 1 |
| By submission | 13 | 0 |
| By decision | 2 | 5 |
| Draws | 1 | |
| Res. | Record | Opponent | Method | Event | Date | Round | Time | Location | Notes |
| Loss | 19–6–1 | Kevin Holland | Decision (unanimous) | UFC Fight Night: Edwards vs. Brady | March 22, 2025 | 3 | 5:00 | London, England | |
| Win | 19–5–1 | Bryan Barberena | Submission (armbar) | UFC 286 | March 18, 2023 | 1 | 4:51 | London, England | Performance of the Night. |
| Win | 18–5–1 | Takashi Sato | Decision (unanimous) | UFC Fight Night: Volkov vs. Aspinall | March 19, 2022 | 3 | 5:00 | London, England | |
| Loss | 17–5–1 | Gilbert Burns | Decision (unanimous) | UFC Fight Night: Hermansson vs. Cannonier | September 28, 2019 | 3 | 5:00 | Copenhagen, Denmark | |
| Loss | 17–4–1 | Leon Edwards | Decision (split) | UFC Fight Night: Till vs. Masvidal | March 16, 2019 | 3 | 5:00 | London, England | |
| Win | 17–3–1 | Alex Oliveira | Submission (rear-naked choke) | UFC 231 | December 8, 2018 | 2 | 4:17 | Toronto, Ontario, Canada | |
| Loss | 16–3–1 | Santiago Ponzinibbio | KO (punches) | UFC Fight Night: Nelson vs. Ponzinibbio | July 16, 2017 | 1 | 1:22 | Glasgow, Scotland | |
| Win | 16–2–1 | Alan Jouban | Submission (guillotine choke) | UFC Fight Night: Manuwa vs. Anderson | March 18, 2017 | 2 | 0:46 | London, England | Performance of the Night. |
| Win | 15–2–1 | Albert Tumenov | Submission (neck crank) | UFC Fight Night: Overeem vs. Arlovski | May 8, 2016 | 2 | 3:15 | Rotterdam, Netherlands | Performance of the Night. |
| Loss | 14–2–1 | Demian Maia | Decision (unanimous) | UFC 194 | December 12, 2015 | 3 | 5:00 | Las Vegas, Nevada, United States | |
| Win | 14–1–1 | Brandon Thatch | Submission (rear-naked choke) | UFC 189 | July 11, 2015 | 1 | 2:54 | Las Vegas, Nevada, United States | |
| Loss | 13–1–1 | Rick Story | Decision (split) | UFC Fight Night: Nelson vs. Story | October 4, 2014 | 5 | 5:00 | Stockholm, Sweden | |
| Win | 13–0–1 | Zak Cummings | Submission (rear-naked choke) | UFC Fight Night: McGregor vs. Brandão | July 19, 2014 | 2 | 4:48 | Dublin, Ireland | Performance of the Night. |
| Win | 12–0–1 | Omari Akhmedov | Submission (guillotine choke) | UFC Fight Night: Gustafsson vs. Manuwa | March 8, 2014 | 1 | 4:36 | London, England | Performance of the Night. |
| Win | 11–0–1 | Jorge Santiago | Decision (unanimous) | UFC on Fuel TV: Barão vs. McDonald | February 16, 2013 | 3 | 5:00 | London, England | |
| Win | 10–0–1 | DaMarques Johnson | Submission (rear-naked choke) | UFC on Fuel TV: Struve vs. Miocic | September 29, 2012 | 1 | 3:34 | Nottingham, England | Catchweight (175 lb) bout; Johnson missed weight (183 lb). |
| Win | 9–0–1 | Alexander Butenko | Submission (armbar) | Cage Contender 12 | February 25, 2012 | 1 | 4:21 | Dublin, Ireland | |
| Win | 8–0–1 | Eugene Fadiora | Submission (neck crank) | BAMMA 4 | September 25, 2010 | 1 | 3:51 | Birmingham, England | |
| Win | 7–0–1 | Danny Mitchell | Submission (rear-naked choke) | Cage Contender 6 | August 28, 2010 | 1 | 2:51 | Manchester, England | |
| Win | 6–0–1 | Sam Elsdon | Submission (rear-naked choke) | BAMMA 2 | February 13, 2010 | 1 | 2:30 | London, England | |
| Win | 5–0–1 | Iran Mascarenhas | KO (punch) | Adrenaline 3 | September 6, 2008 | 2 | 3:22 | Copenhagen, Denmark | |
| Win | 4–0–1 | Barry Mairs | TKO (punches) | Angrrr Management 14 | December 9, 2007 | 1 | 3:38 | London, England | |
| Win | 3–0–1 | Niek Tromp | TKO (punches) | Cage of Truth 1 | November 24, 2007 | 1 | 1:50 | Dublin, Ireland | |
| Win | 2–0–1 | Adam Slawinski | TKO (punches) | Ultimate Fighting Revolution 10 | October 6, 2007 | 1 | 2:30 | Galway, Ireland | |
| Win | 1–0–1 | Driss El Bakara | Submission (armbar) | Cage Rage Contenders: Dynamite | September 29, 2007 | 1 | 3:46 | Dublin, Ireland | |
| Draw | 0–0–1 | John Olesen | Draw (split) | Adrenaline 1 | May 5, 2007 | 3 | 5:00 | Copenhagen, Denmark |
| 14 Matches, 8 Wins (4 Submissions), 6 Losses (1 Submission) | |||||||
| Result | Rec. | Opponent | Method | Event | Division | Date | Location |
| Loss | 8-6 | Alexandre Ribeiro | Points | ADCC World Championship | Absolute | September 25, 2011 | Nottingham |
| Win | 8-5 | Bruno Frazzato | Points | ||||
| Loss | 7-5 | André Galvão | Points | -88 kg | September 24, 2011 | ||
| Win | 7-4 | Marko Helen | Points | ||||
| Win | 6-4 | Bjarni Kristjánsson | Submission (guillotine choke) | Mjolnir Open | Absolute | September 3, 2011 | Reykjavík |
| Win | 5-4 | Brynjólfur Ingvarsson | Submission (armbar) | ||||
| Win | 4-4 | Mike Russell | Submission (rear naked choke) | Health & Fitness Expo | Superfight | November 20, 2010 | Reykjavík |
| Loss | 3-4 | Azunna Anyanwu | Points | Grapplers Quest: Beast of the East | Absolute | March 20, 2010 | Caldwell, NJ |
| Win | 3-3 | Ronnie Mikvenski | Points | ||||
| Loss | 2-3 | Vinny Magalhães | Points | ADCC World Championship | Absolute | September 27, 2009 | Barcelona |
| Loss | 2-2 | Alexandre Ribeiro | Submission (kneebar) | ||||
| Win | 2-1 | David Avellan | Submission (rear naked choke) | ||||
| Win | 1-1 | Jeff Monson | Points | ||||
| Loss | 0-1 | James Brasco | Referee Decision | -88 kg | September 26, 2009 | ||