Jacob Christopher Ortiz (born January 23, 1975) is a Mexican-American mixed martial artist and former Ultimate Fighting Championship fighter from Huntington Beach, California. A former UFC Light Heavyweight Champion, from April 14, 2000 to September 26, 2003, Ortiz emerged as one of the sport's biggest stars, becoming the biggest pay-per-view draw of 2006 and appearing on the covers of various magazines. Ortiz is the CEO of the Punishment Athletics clothing and mixed martial arts equipment line.

Tito is the youngest of four sons born to a Mexican-American father and a European-American mother, and his mixed heritage is reflected in his ring entrances as he bears both Mexican and American flags. Ortiz has a son from his marriage to his ex-wife, Kristen. He is now dating former adult film actress, Jenna Jameson, who on March 16, 2009 gave birth to twin boys named Jesse and Journey.

Ortiz began his martial arts career as a wrestler in his sophomore year of high school in Huntington Beach, California. Under coach Paul Herrera, Ortiz finished fourth in the state high school championships as a senior. Following high school, Ortiz continued his wrestling career, winning a California state junior college title for Golden West College. Following his stint at Golden West, Ortiz wrestled at Cal State Bakersfield. Ortiz trained with future NCAA, World, and Super Bowl champion Stephen Neal. Tito has written a book called "This Is Gonna Hurt" - The Life of a Mixed Martial Arts champion".