UFC 125: Resolution was a mixed martial arts event held by the Ultimate Fighting Championship on January 1, 2011 at the MGM Grand Garden Arena in Las Vegas, Nevada.

[4][5] On October 26, 2010, Shane Carwin had to pull out of his fight with Roy Nelson due to a back injury that required surgery.

[7] Josh Grispi was pulled from a planned WEC 52 bout with Erik Koch to challenge Aldo for the Featherweight title at this event.

[10] A lightweight bout between Cole Miller and Matt Wiman, which was originally scheduled to take place at this event, was moved to UFC: Fight For The Troops 2.

[12] The preliminary fights were shown live in the United Kingdom on ESPN, Rogers Sportsnet in Canada[13] and Fuel TV in Australia.