Jonathan Dwight Jones is an American professional mixed martial artist who is currently signed with the Ultimate Fighting Championship (UFC). Widely regarded as one of the greatest professional fighters of all-time, he is the current and two-time undisputed UFC Light Heavyweight Champion. He has been his weight class' champion since December 29, 2018, and previously held the title from March 20, 2011, to April 28, 2015. Jones also held the interim UFC Light Heavyweight Championship April 23, 2016, to November 9, 2016, making him a three-time UFC champion overall. As of January 2, 2019, he is #2 in official UFC pound-for-pound rankings. He is the younger brother of former National Football League (NFL) player Arthur Jones and the older brother of current NFL player Chandler Jones.

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With his first title victory over Maurício Rua in 2011, Jones became the youngest champion since the UFC instituted weight classes at age 23. He holds many UFC records in the light heavyweight division, including the most successful and consecutive title defenses, most wins, longest win streak, and most submission victories. During the height of his championship reign, Jones was considered by many to be the best pound-for-pound fighter in the world. Never stopped nor outscored during his career, Jones' lone professional loss is a controversial disqualification against Matt Hamill, a result that Hamill and UFC President Dana White dispute.

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Between 2015 and 2017, Jones was involved in several controversies and lost his title three times time as a result of disciplinary action. He was first stripped of his title and removed from the official rankings by the UFC in 2015 after he was arrested on felony hit-and-run charges. His subsequent returns to the UFC in 2016 and 2017 saw him emerge victorious in title bouts against Ovince Saint Preux and Daniel Cormier, but were both cut short by Jones testing positive for banned substances and receiving further suspensions, with the latter reversed to a 'no contest'. After his 2017 suspension was lifted, Jones reclaimed the championship in 2018 by defeating Alexander Gustafsson and successfully defended it in his two following fights.

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Jones and his fiancée Jessie have three daughters: Leah, born in 2008; Carmen Nicole Jones, born in 2009; and Olivia Haven born in 2013. In an interview with Joe Rogan on December 1, 2016, Jones stated that he has four daughters (aged 9, 8, 6 and 3), indicating a daughter born before Leah. Source.