UFC 264: Poirier vs. McGregor 3 was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on July 10, 2021 at the T-Mobile Arena in Paradise, Nevada, part of the Las Vegas Metropolitan Area, United States. A lightweight trilogy between former interim UFC Lightweight Champion Dustin Poirier and former UFC Featherweight and Lightweight Champion Conor McGregor headlined the event.

• Ultimate Fighting Championship
• Dustin Poirier
• Conor McGregor
• Gilbert Burns
• Stephen Thompson
• Tai Tuivasa
• Greg Hardy
• Irene Aldana
• Yana Santos