The 2011 Mr. Olympia contest was an IFBB professional bodybuilding competition and the feature event of Joe Weider's Olympia Fitness & Performance Weekend 2011 held September 15–18, 2011 at the Las Vegas Convention Center and Orleans Arena in Las Vegas, Nevada. It was the 47th Mr. Olympia competition. Other events at the exhibition included the 202 Olympia Showdown, Ms. Olympia, Fitness Olympia, and Figure Olympia contests.

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• Jay Cutler tore his left biceps several weeks before the competition, the injury impacted his conditioning and later required surgery to repair
• Phil Heath won his first championship in his fourth Mr. Olympia competition

• 2011 Ms. Olympia