UFC Fight Night: Thomas vs. Florian (also known as UFC Fight Night 11) was a mixed martial arts (MMA) event held by the Ultimate Fighting Championship (UFC) on Wednesday, September 19, 2007 at the Palms Casino Resort in Las Vegas, Nevada. It was broadcast live in the United States and Canada on Spike TV as a lead-in to the debut of The Ultimate Fighter 6.

The main event was originally expected to be a rematch between The Ultimate Fighter 1 contestants Chris Leben and Mike Swick. Leben, however, chose to decline the fight offer (Leben later claimed that his managers turned down the fight without his knowledge on an Ultimate Fighter 1 reunion episode). Swick was to be featured on the main card in a match against Canadian fighter Jonathan Goulet, who confirmed the bout on July 18 to The Fight Network. Reports indicate that veteran UFC fighter Chris Lytle was also considered for the bout. However, Swick pulled out of the bout on September 2, 2007 due to a rib injury. Goulet faced Dustin Hazelett instead.

The card was rescheduled to feature a lightweight main event bout between Din Thomas and Spencer Fisher. However, on August 7, Fisher announced via his MySpace page that he was withdrawing from the event due to a staph infection in his knee. Former title challenger Kenny Florian replaced Fisher in the main event.

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