The 2012 Mr. Olympia contest was an IFBB professional bodybuilding competition and the feature event of Joe Weider's Olympia Fitness & Performance Weekend 2012 held September 27–30, 2012 at the Las Vegas Convention Center and Orleans Arena in Las Vegas, Nevada. It was the 48th Mr. Olympia competition. Other events at the exhibition included the 212 Olympia Showdown, Ms. Olympia, Fitness Olympia, and Figure Olympia contests. The documentary film Generation Iron was filmed while following several Olympia contestants as they prepared for this competition.