UFC 101: Declaration was a mixed martial arts pay-per-view event held by the Ultimate Fighting Championship (UFC) on August 8, 2009 in Philadelphia, Pennsylvania. It was the first UFC event held in Philadelphia. The event featured the second title defense of Lightweight Champion BJ Penn against Kenny Florian, and a non-title Light Heavyweight bout for Middleweight Champion Anderson Silva against former Light Heavyweight Champion Forrest Griffin.

• B.J. Penn
• Kenny Florian
• Anderson Silva
• Forrest Griffin
• Aaron Riley
• Shane Nelson
• Johny Hendricks
• Amir Sadollah