UFC 129: St-Pierre vs. Shields was a mixed martial arts event held by the Ultimate Fighting Championship on Saturday, April 30, 2011 at Rogers Centre in Toronto, Ontario, Canada.

UFC 129 then sold out when tickets went on sale to the general public on February 12, with officials scrambling to up the number of seats to 55,000.

[12] In a conference call for UFC: Fight For The Troops 2 in January 2011, Dana White confirmed that UFC Featherweight Champion José Aldo would defend his title against Mark Hominick on this card, provided that Hominick defeated George Roop.

[13] White also stated that, regardless of the outcome of the Hominick/Roop fight, Aldo would still defend his Featherweight Championship at this event.

[27] However, on April 21, the UFC instead announced that all of the prelims (except the two fights airing on Spike) would be on the Facebook stream.