UFC 266: Volkanovski vs. Ortega is a mixed martial arts event produced by the Ultimate Fighting Championship that took place on September 25, 2021 T-Mobile Arena in Paradise, Nevada, United States.
| Weight Class | Fight | Method | Round | Result |
| Featherweight | Alexander Volkanovski vs. Brian Ortega | Decision | R5 (05:00) | Alexander Volkanovski def. Brian Ortega |
| Women Flyweight | Valentina Shevchenko vs. Lauren Murphy | KO/TKO | R4 (04:00) | Valentina Shevchenko def. Lauren Murphy |
| Welterweight | Nick Diaz vs. Robbie Lawler | KO/TKO | R3 (00:44) | Robbie Lawler def. Nick Diaz |
| Heavyweight | Curtis Blaydes vs. Jairzinho Rozenstruik | Decision | R3 (05:00) | Curtis Blaydes def. Jairzinho Rozenstruik |
| Women Flyweight | Jéssica Andrade vs. Cynthia Calvillo | KO/TKO | R1 (04:54) | Jéssica Andrade def. Cynthia Calvillo |
| Weight Class | Fight | Method | Round | Result |
| Bantamweight | Marlon Moraes vs. Merab Dvalishvili | KO/TKO | R2 (04:25) | Merab Dvalishvili def. Marlon Moraes |
| Lightweight | Dan Hooker vs. Nasrat Haqparast | Decision | R3 (05:00) | Dan Hooker def. Nasrat Haqparast |
| Heavyweight | Shamil Abdurakhimov vs. Chris Daukaus | KO/TKO | R2 (01:23) | Chris Daukaus def. Shamil Abdurakhimov |
| Women Flyweight | Roxanne Modafferi vs. Taila Santos | Decision | R3 (05:00) | Taila Santos def. Roxanne Modafferi |
| Weight Class | Fight | Method | Round | Result |
| Lightweight | Uroš Medić vs. Jalin Turner | Submission | R1 (04:01) | Jalin Turner def. Uroš Medić |
| Middleweight | Cody Brundage vs. Nick Maximov | Decision | R3 (05:00) | Nick Maximov def. Cody Brundage |
| Welterweight | Matthew Semelsberger vs. Martin Sano | KO/TKO | R1 (00:15) | Matthew Semelsberger def. Martin Sano |
| Featherweight | Jonathan Pearce vs. Omar Morales | Submission | R2 (03:31) | Jonathan Pearce def. Omar Morales |
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