Carlos "The Ronin" Newton (born August 17, 1976 in the British Virgin Islands) is a Canadian mixed martial arts fighter, fighting out of and teaching at Warrior Martial Arts Centre in Newmarket, Ontario. He has competed in UFC, Pride FC, and various MMA promotions of lower profile under the supervision of his coach and mentor, Terry Riggs. Newton has dubbed his personal fighting style an amalgam of traditional Jujutsu, judo, and wrestling Dragon Ball Jiu-Jitsu" in tribute to Dragon Ball, a Japanese comic and anime series.

His nickname, "The Ronin," is a reflection of both his training methods and his interest in the martial culture of feudal Japan. He has a professional MMA record of 13-13-0 as of February 2008 and was the coach for the Toronto Dragons of the International Fight League.

Newton's professional fighting career began at the early age of 19, with a submission loss due to sheer exhaustion against Jean Riviere on the Extreme Fighting 2 card in April 1996. After wins in Japan's Shooto organization including its Japan Vale Tudo events, Newton's fourth and fifth fights marked his UFC debut at UFC 17, defeating Bob Gilstrap and losing to Dan Henderson on the same night. In June 1998, Newton lost a technical bout in Pride Fighting Championships against Kazushi Sakuraba. Neither Sakuraba nor Pride FC had truly come into their own at that time, but the Sakuraba vs. Newton fight is remembered today as a classic.

Newton's greatest professional accomplishment in his career so far has been capturing the UFC Welterweight Championship from Pat Miletich in May 2001. The reign was short lived however, as Newton lost his first title defense to what some consider a controversial decision in November of that same year at UFC 34 against accomplished wrestler Matt Hughes.

Newton's successes since his first encounter with Hughes have been few, but notable. Newton rebounded from his first loss to Hughes with a spectacular armbar or juji-gatame victory over Jose "Pele" Landi-Jons at Pride 19 in February, 2002, and in October, 2003 Newton won a split-decision victory over the estimable Renzo Gracie at Pride Bushido 1. Currently, Newton is a coach in the upstart International Fight League, an MMA promotion using a team concept and salaried fighters. Newton's team, the Dragons, is scheduled to compete in the next eight-team tournament in the IFL, which is scheduled to begin in September 2006.

Newton was set for a comeback fight at K-1's HEROs MMA promotion against Melvin Manhoef at the Ariake Coliseum on August 5th, but had to pull out of the fight at the last minute due to a torn ligament in his knee. He made a second attempt at a comeback in K-1 HEROs, this time facing Tokimitsu Ishizawa. Newton made short work of the Japanese fighter, needing only four punches to score the TKO victory in just 22 seconds. He then lost to Renzo Gracie controversially by split decision at IFL Championship Final.

His most recent bouts were submission losses to Matt Lindland at IFL Houston and to Shungo Oyama at Hero's Korea 2007.

On The Fight Network Radio, Mike Russell reported that Carlos Newton was let go as an IFL coach and will be replaced by Ian Freeman for the 2008 season.