UFC 85: Bedlam was a mixed martial arts event held by the Ultimate Fighting Championship (UFC) on June 7, 2008, at The O2 Arena in London, United Kingdom.

The main event was ultimately changed to Matt Hughes against Thiago Alves.

Hughes took the fight on short notice as a favor to the UFC and Alves came in four pounds overweight.

In other changes, a Jonathan Goulet and Paul Kelly match was cancelled when Goulet dropped out citing a lack of training time, followed by Kelly withdrawing before his opponent could be named because of an injury sustained in practice.

Due to legal problems which resulted in a lack of time to prepare for his fight with Michael Bisping, Chris Leben was forced to withdraw from the card and the UFC announced Jason Day would face Bisping.