UFC 138: Leben vs. Munoz took place on November 5, 2011 at the LG Arena in Birmingham, England. The event was the second that the UFC has hosted in Birmingham, the first being UFC 89 back in 2008.
The main card was aired via 5 hour tape delay on Spike TV in the U.S., and live on Sportsnet in Canada. The preliminary bouts were streamed live on Facebook.
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This event drew a reported 10,823 attendees and generated a live gate of $1.5 million. The Spike TV portion drew an average audience of 1.8 million viewers (and a 1.2 household rating) and peaked with more than 2.1 million viewers on Spike TV.
UFC 138 Post Fight Analysis
UFC 138 Tapology UFC 138 Pre-Fight Analysis
| Match | Winner | Loser | Method | Round | Time |
| 1 | Chris Cariaso | Vaughan Lee | Decision (Split) | 3 | 5:00 |
| 2 | Che Mills | Chris Cope | TKO (Knees and Punches) | 1 | 0:40 |
| 3 | Michihiro Omigawa | Jason Young | Decision (Unanimous) | 3 | 5:00 |
| 4 | Philip De Fries | Rob Broughton | Decision (Unanimous) | 3 | 5:00 |
| 5 | John Maguire | Justin Edwards | Decision (Unanimous) | 3 | 5:00 |
| 6 | Terry Etim | Edward Faaloloto | Submission (Guillotine Choke) | 1 | 0:17 |
| 7 | Anthony Perosh | Cyrille Diabate | Submission (Rear-Naked Choke) | 2 | 3:09 |
| 8 | Thiago Alves | Papy Abedi | Submission (Rear-Naked Choke) | 1 | 3:32 |
| 9 | Renan Pegado | Brad Pickett | Submission (Rear-Naked Choke) | 1 | 4:09 |
| 10 | Mark Munoz | Chris Leben | TKO (Corner Stoppage) | 2 | 5:00 |
