UFC 138: Leben vs. Munoz was a mixed martial arts event held by the Ultimate Fighting Championship on November 5, 2011 at LG Arena in Birmingham, United Kingdom. The event aired on the same day, via tape delay, on Spike TV in the U.S. and live on Sportsnet in Canada. The event was the second that the UFC has hosted in Birmingham, the first was UFC 89 back in 2008 also featuring Chris Leben in the main event.