UFC 134: Silva vs. Okami, also known as UFC Rio, was a mixed martial arts (MMA) pay-per-view event held by the Ultimate Fighting Championship on August 27, 2011 at the HSBC Arena in Rio de Janeiro, Brazil. The event was the second that the UFC has hosted in Brazil, since 1998's UFC 17.5: Ultimate Brazil. UFC 134 was awarded the 2011 event of the year by Sherdog.

UFC 1, 2, and 4 Tournament winner Royce Gracie was briefly linked to the event, but the rumors were refuted by UFC president Dana White.

Maiquel Falcão was scheduled to take on Tom Lawlor at this event, but was released from the promotion in regard to a 2002 assault charge. Lawlor was instead moved to UFC 139 to take on Chris Weidman.

Mackens Semerzier was expected to face Yuri Alcantara at the event, but was replaced by UFC newcomer Antonio Carvalho. However, Carvalho was forced out of the bout with an injury and replaced by newcomer Felipe Arantes.

Alexandre Ferreira was expected to face Rousimar Palhares at this event. However, Ferreira was forced out of the bout with an injury and replaced by Dan Miller.

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