UFC on FX: Belfort vs. Rockhold (also known as UFC on FX 8) was a mixed martial arts event held on May 18, 2013 at the Arena Jaraguá in Jaraguá do Sul, Brazil. The event was broadcast live on FUEL TV and FX.

The event was headlined by a middleweight bout between perennial multi-divisional contender Vitor Belfort and the final Strikeforce Middleweight Champion and promotional newcomer and future UFC Middleweight Champion Luke Rockhold.

Manvel Gamburyan was expected to face Hacran Dias at the event. However, Gamburyan was forced to pull out of the bout citing an injury and was replaced by Nik Lentz.

Marcos Vinícius was expected to face Yuri Alcantara at the event. However, Vinicius was forced out of the bout citing an injury and was replaced by promotional newcomer Iliarde Santos

Cezar Ferreira was originally scheduled to face CB Dollaway. However, on April 1, it was revealed that Dollaway had to withdraw from the bout due to injury and he was replaced by Chris Camozzi. Then on April 7, it was confirmed that Ferreira had pulled out of the fight as well, citing an injury and was replaced by Rafael Natal.

Costas Philippou had to withdraw from his fight against Ronaldo Souza, after suffering a cut above his eye, and was replaced by Chris Camozzi. Camozzi's scheduled opponent Rafael Natal instead faced promotional newcomer Joao Zeferino.

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