UFC 123: Rampage vs. Machida was a mixed martial arts event held by the Ultimate Fighting Championship on November 20, 2010 at the Palace of Auburn Hills in Auburn Hills, Michigan. It was the first UFC event in the Metro Detroit area since UFC 9.
A private ceremony was hosted an hour before the start of the card, where José Aldo was awarded the inaugural UFC Featherweight Championship belt by Dana White. Fans in the building were not permitted to view the ceremony.
UFC 123 featured preliminary fights live on Spike TV.