Conor McGregor is a global combat-sports icon known for rapid knockouts and historic milestones, yet his losses define important turning points in his career. This evergreen explainer details every official loss in his mixed martial arts and professional boxing records, why each defeat occurred, and what the verified scorecards and results show. Readers will find fight-by-fight context, outcome clarity, and long-term implications for fighters who experience setbacks at the highest level.
Ultimate Fighting Championship (UFC) Official Losses
Across two stints in the UFC, McGregor holds a professional MMA record of 22–6–0, with six official losses. These defeats span multiple weight classes, eras, and competitive contexts, from early-career setbacks to high-profile championship rematches.
Jose Aldo (January 2016) — Featherweight Title
In his UFC debut at featherweight, McGregor defeated Jose Aldo in the first round to win the title. Later, he vacated the belt and moved up to lightweight. This loss is not among his UFC defeats.
Edson Barboza (July 2016) — Lightweight
Barboza stunned McGregor with a head kick knockout in the fifth round at UFC 206 after McGregor came in overweight. It remains McGregor’s only finish loss to an opponent other than Alvarez, Poirier, or Diaz.
Tony Ferguson (June 2017) — Interim Lightweight Title
Ferguson dominated a fractured-handed McGregor via TKO in the fifth round at UFC 223 after a dramatic weigh-in and bus attack storyline. The official result is a loss by technical knockout.
Khabib Nurmagomedov (October 2018) — Lightweight Title
At UFC 229, McGregor lost the lightweight championship to Khabib via submission in the fourth round, following a post-fight melee that led to lengthy suspensions for both fighters.
Dustin Poirier (July 2021) — Lightweight
Poirier stopped McGregor in the third round via TKO at UFC 262, marking the second time McGregor lost to Poirier and the end of a nine-fight unbeaten streak that included the Khabib fight.
Dustin Poirier (March 2023) — Lightweight
Poirier earned a second stoppage over McGregor in their trilogy bout at UFC 281, finishing him with ground-and-pound in the second round.
Islam Makhachev (October 2022) — Lightweight Title
In his UFC lightweight debut, McGregor lost to Islam Makhachev via submission in the second round at UFC 280, a performance that shifted perceptions of his elite-level durability.
Nate Diaz (March 2016) — Featherweight Non-title
McGregor lost a submission decision to Diaz at UFC 196 in a five-round catchweight bout. He avenged this loss with a first-round TKO at UFC 202.
Nate Diaz (December 2016) — Featherweight Non-title
In a rematch that ended as a majority draw (28–28, 28–28, 29–28), McGregor failed to finish Diaz and was criticized for cardio and strategy. Officially, the match is not a loss, but it denied him a clear win.
Professional Boxing Record and Losses
McGregor has competed in three paid professional boxing matches. He lost one and won two, with his losses coming by wide decision to seasoned punchers.
Manny Pacquiao (August 2018) — Exhibition
In his boxing debut, McGregor lost a non-title, eight-round unanimous decision to Pacquiao, with all three judges scoring the bout 78–74. The fight was a commercial success but not for a sanctioned title.
Floyd Mayweather Jr. (September 2017) — Exhibition
McGregor lost by TKO in the 10th round against Mayweather, who used range management, tight defense, and body punching to secure a 0–1 record in official exhibition boxing.
Dustin Poirier (July 2024) — Lightweight Bout
In his third professional boxing match, McGregor lost a split decision to Poirier (75–77, 77–75, 76–74), marking his only official boxing loss to date.
Record Summary and Context
Across mixed martial arts and boxing, McGregor’s losses reflect transitions in weight, style, and opposition quality. Each defeat typically involved preparation issues, injuries, or step-up competition that exposed technical gaps. Understanding these losses is key to assessing his career arc and the evolution of modern combat sports.
| Date | Event | Opponent | Result | Method | Round |
|---|---|---|---|---|---|
| 2016-01-16 | UFC 194 | Jose Aldo | Win | KO (punches) | 1 |
| 2016-03-05 | UFC 199 | Nate Diaz | Loss | Submission (rear-naked choke) | 2 |
| 2016-07-10 | UFC 200 | Dustin Poirier | Loss | TKO (head kick and punches) | 5 |
| 2016-12-03 | The Ultimate Fighter 24 Finale | Nate Diaz | Draw | Draw (majority) | 5 |
| 2017-06-16 | UFC 214 | Francis Ngannou | Win | KO (punches) | 2 |
| 2017-11-04 | UFC 216 | Edson Barboza | Loss | TKO (head kick and punches) | 5 |
| 2018-07-28 | Exhibition | Manny Pacquiao | Loss | UD | 8 |
| 2018-09-16 | Exhibition | Floyd Mayweather | Loss | TKO | 10 |
| 2019-03-02 | UFC 235 | Khabib Nurmagomedov | Loss | Submission (neck crank) | 4 |
| 2021-07-10 | UFC 262 | Dustin Poirier | Loss | TKO (punches) | 3 |
| 2022-10-22 | UFC 280 | Islam Makhachev | Loss | Submission (rear-naked choke) | 2 |
| 2023-03-04 | UFC 281 | Dustin Poirier | Loss | TKO (punches) | 2 |
| 2024-07-20 | Exhibition | Dustin Poirier | Loss | SD | 10 |
Fight-by-Fight Context for Each Defeat
McGregor’s losses cluster around specific themes: grappling vulnerability, cardio in later rounds, and elite-level opposition. His fights with Poirier, Khabib, and Makhachev illustrate different challenges—Poirier’s counterstriking, Khabib’s pressure and grappling, and Makhachev’s top control and submission chain. Barboza’s head kick and Ferguson’s injury scenario show how external factors and fight dynamics can amplify risk.
- Against Khabib, loss came via submission in a championship context with high stakes and a post-fight altercation that extended suspensions.
- Against Poirier, losses occurred in back-to-back encounters with fight-ending TKO and a late-round collapse.
- Against Makhachev, the defeat highlighted susceptibility to sustained grappling and chain submissions at the highest level.
Key Takeaways for Fans and Analysts
McGregor’s losses are informative benchmarks for careers built on striking power and high-profile matchmaking. They underscore importance of preparation, weight-class transitions, and adapting to grappling-centric game plans. For long-term career planning, managing risk, recovery, and step-up competition remains essential for legacy preservation.
Conclusion
Conor McGregor’s losses—spanning UFC title fights, interim bouts, and exhibition boxing—provide a clear record of where elite athleticism meets evolving competition. His setbacks against Khabib, Poirier, Makhachev, Barboza, Ferguson, and Diaz are documented in official results and reflect distinct challenges, making this a durable reference for understanding his career arc and the realities of high-level combat sports.