Christopher James Weidman (born June 17, 1984) is an American professional mixed martial artist. He competed in the Middleweight division of the Ultimate Fighting Championship (UFC), where he is a former UFC Middleweight Champion.

An accomplished amateur wrestler, Weidman was a two-time NJCAA All-American and a two-time NCAA Division I All-American during his collegiate career. He began his mixed martial arts career in 2008, and joined the UFC in 2011, soon amassing a 9–0 record. In 2013, Weidman came to worldwide prominence by defeating Anderson Silva to win the UFC Middleweight Championship. This ended Silva's 16-fight winning streak inside the UFC and his seven-year reign as the champion. Weidman retained the title for two and a half years, defending it three times.

Weidman was born in Baldwin, New York, on June 17, 1984, the second of three children. He is of German and Irish descent and was raised as a Lutheran. He and his older brother were involved in numerous athletic activities. Chris started wrestling at a very young age. With his natural athleticism, he mastered the sport very quickly. He attended Baldwin Senior High School on Long Island where he was a Nassau County and New York state wrestling champion.

A standout in college, he earned All-American wrestling honors twice at Nassau Community College before transferring to Hofstra. He became the first junior college wrestler in history to be an NYS Collegiate Champion. At Hofstra, he became a two-time NCAA Division I All-American, placing sixth at the 2006 NCAA championships his junior year and third at the 2007 NCAA's his senior year. Weidman graduated from Hofstra University with a bachelor's degree in psychology as well as a master’s in physical education. He was later a wrestling instructor of the university.

While attending Hofstra, Weidman met Gabriel "Monsta" Toribio, who invited Weidman to come to Matt and Nick Serra's BJJ Academy a few miles from campus in Levittown, New York to help some of the fighters with their wrestling. Weidman also took some submission grappling classes and within three months he competed in and won The East Coast Grappler's Quest in his weight class and the Absolute Division with all 13 matches ending in submissions.

With full-time assistant coaching and graduate school at Hofstra, grappling had to be put on hold for a while. While coaching, Weidman trained for the Olympic trials. When his dream was not attained, Weidman had to decide if he wanted to continue training for the world teams and Olympics or give MMA a shot. Toribio brought Weidman to Ray Longo's MMA Academy and introduced Weidman to Longo. With his noticeable technique and skills, Weidman was encouraged to train full-time to fight. In 2011, Longo and Weidman LAW MMA opened, where they are instructors, owners, and operators in Garden City, New York.

For such a novice fighter to be so aggressive and technical in a pure grappling competition against one of the world's best speaks volumes to what a great MMA middleweight Chris Weidman may become.

After winning the ADCC East Coast Trials, Weidman qualified for and competed at the 2009 ADCC Submission Wrestling World Championship (with one year of formal submission grappling training) in Barcelona where he lost in a quarter-final match-up.