UFC 78: Validation was a mixed martial arts event held by the Ultimate Fighting Championship (UFC), that took place on November 17, 2007, at the Prudential Center in Newark, New Jersey.

[2] Originally, Evans and Bisping were set to rematch their previous opponents Tito Ortiz and Matt Hamill at this event after their bouts ended in a draw and a controversial split decision at UFC 73 and UFC 75.

PRIDE veteran and Cuban judoka Hector Lombard was also scheduled to debut on the event but did not participate due to visa issues.

Lombard's original opponent Karo Parisyan instead faced Ryo Chonan, while Chonan's previous opponent Thiago Alves fought Chris Lytle.

Additionally, PRIDE veterans Ryo Chonan and Akihiro Gono both made their UFC debuts.