James Andrew Miller (born August 30, 1983) is an American professional mixed martial artist.

Born and raised in Sparta Township, New Jersey and the youngest of three brothers, Miller started wrestling at the age of four.

Miller had not originally planned on wrestling at Virginia Tech, but his desire to compete again grew and he made the team as a walk-on later into the season.

Miller earned two more victories in the promotion over Kevin Roddy and Joe Andujar, both via the first-round submission.

The quick victories earned Miller a title shot and he fought Muhsin Corbbrey for the Reality Fighting Lightweight Championship.

In his first title defense, Miller took on future UFC Lightweight Champion Frankie Edgar at Reality Fighting 14.

Miller began training at AMA Fight Club in Whippany, New Jersey with his brother Dan in January 2007.

When the fight resumed, Miller began working for a takedown and after escaping an attempted guillotine, secured a slam, from which he quickly attained the mount and then the back, sinking in a rear-naked choke for the win.

Miller defended his title for the first time at Cage Fury Fighting Championships 5 against Atlantic City MMA's Anthony Morrison.

Morrison delivered some big slams early, but Miller worked through a chain of submissions before securing the victory by triangle choke at 4:56 of the first round to retain his title.

[12] Miller next acted as a late replacement for Frankie Edgar against Matt Wiman at UFC: Fight for the Troops.

[16] Miller next faced The Ultimate Fighter winner Mac Danzig on July 11, 2009, at UFC 100, and won in a one-sided unanimous decision.

Both fighters exchanged competitively on the feet, but Miller won after Lopez injured his shoulder in round two.

[22] Sean Sherk agreed to step up from the undercard and fight Miller, rather than his original opponent in Rafaello Oliveira.

[24] Miller looked comfortable and sharp on his feet exchanging with the seasoned striker in Ludwig and scored a knockdown halfway through the round with a fast combination.

[27] Miller fought Gleison Tibau at UFC Fight Night 22 winning via unanimous decision.

[29] Miller defeated Oliveira via a first round kneebar to extend his winning streak to six and earning the Submission of the Night bonus.

[31] Miller won the fight via TKO in the third round, after landing an uppercut and knee to Shalorus's face.

[38] He lost the fight via submission, for the first time in his professional career, in the second round due to a guillotine choke.

[39] Miller faced Joe Lauzon on December 29, 2012, at UFC 155, replacing an injured Gray Maynard.

[45] The two were originally scheduled to meet in 2008 at IFL 22 but the bout was scrapped after Camões was forced to withdraw due to injury.

[47] However, in the week leading up to the event, Green pulled out of the bout citing an injury and was replaced by Yancy Medeiros.

[52] However, Felder was forced to pull out of the event due to a knee injury and was replaced by Beneil Dariush.

[54] Miller faced Danny Castillo on July 25, 2015, at UFC on Fox 16, replacing Rustam Khabilov who was pulled from the card with alleged visa issues.

[61] Miller next faced former Pride FC Lightweight Champion Takanori Gomi on July 9, 2016, at UFC 200.

[63] After sustaining virtually no damage during his previous fight, Miller was quickly rescheduled to rematch Joe Lauzon on August 27, 2016, at UFC on Fox 21.

[106] The bout between Miller and Nikolas Motta eventually took place at UFC Fight Night 201 on February 19, 2022.

[110] A week before the event, Green was forced to pull out of the bout and Miller was instead booked at welterweight in a rematch against Donald Cerrone.

[118] In turn, Gordon was pulled from the bout on the week of the event after not being medically cleared and was replaced by promotional newcomer Jesse Butler.

[9][132] Prior to their careers in mixed martial arts, Jim and his brother Dan worked in construction with their father.