Extreme Rules (2012) was a professional wrestling pay-per-view (PPV) event produced by WWE. It took place on April 29, 2012 at the Allstate Arena in Rosemont, Illinois. It was the fourth event under the Extreme Rules chronology. Eight professional wrestling matches were scheduled on the event's card and one pre-show match was streamed on YouTube. It included Brock Lesnar's first WWE match since WrestleMania XX in 2004.

The concept of Extreme Rules was that the event comprised various hardcore-based matches. In the main event, John Cena defeated Brock Lesnar in an Extreme Rules match. Elsewhere on the card, CM Punk defeated Chris Jericho in a Chicago Street Fight to retain the WWE Championship, and Sheamus defeated Daniel Bryan in a 2-out-of-3 falls match to retain the World Heavyweight Championship.

The pay-per-view received universally positive reviews, with the main event and two world championship matches drawing high praise from critics and fans. The event received 263,000 buys, up 25.8% from the 209,000 buys for the previous year's event, whereas the next Extreme Rules event in 2013 received 231,000 buys, a drop of 12.1%.

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