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Jonathan J. "Jack" O'Neill is a fictional character in the Canadian-American military science fiction television series Stargate SG-1, Stargate Atlantis and Stargate Universe, three science fiction shows about military teams exploring the galaxy via a network of alien transportation devices. Played by American actor Richard Dean Anderson, O'Neill was a main character in the first eight seasons of Stargate SG-1 (1997–2005). O'Neill had a recurring role in Stargate Atlantis for the first three seasons (2004–2007), and he also appeared in the 2008 direct-to-DVD SG-1 film Stargate: Continuum as a minor character. Anderson reduced his character's status in season six to spend more time with his family, eventually leaving the show after season eight, thereby removing himself from the status of main character.

Colonel Jack O'Neill (spelled Jack O'Neil in the film, and given as John O'Neill in one case, and John J. O'Neill in another ) makes his first appearance, played by actor Kurt Russell, in the 1994 military science fiction film Stargate, written by Dean Devlin and Roland Emmerich. Colonel O'Neill has extensive experience in special operations, and he led the first team through the Stargate on a reconnaissance mission. After the creation of Stargate Command (SGC) in "Children of the Gods", the pilot episode of Stargate SG-1, he is given command of the primary SG team, SG-1, which consists of Daniel Jackson, Teal'c and Samantha "Sam" Carter. Promoted to brigadier general in season 8, O'Neill is chosen as the Commanding Officer of Stargate Command after George Hammond's promotion to the Department of Homeworld Security. At the start of season 9, O'Neill is again promoted, this time to the head of Homeworld Security, so that Richard Dean Anderson could leave the show to spend time with his family. Colonel O'Neill appears in most episodes of the first eight seasons of Stargate SG-1; however, he only appears in 4 episodes of season 9 and 10.

Jack O'Neill is a United States Air Force colonel with experience in special operations before joining the Stargate Program. He was married to Sarah O'Neill, but divorced after their son accidentally shot himself with O'Neill's pistol. He then joins a suicidal mission through the Stargate with a couple of airmen and Dr. Daniel Jackson who deciphers the Stargate. They are transported to another planet where O'Neill's standing order is to detonate a nuclear warhead near the Stargate at the sign of danger, but a young boy named Skaara gives him a renewed sense of life. After the defeat of Ra, O'Neill and his team return to Earth while Jackson remains on the planet.

O'Neill returns to the Stargate Program when the Goa'uld Apophis attacks Earth. He is given command of SG-1, which consists of Samantha Carter, Teal'c and Jackson. Eventually O'Neill gets the Repository of the Ancients temporarily "downloaded" to his brain and becomes the first modern human to travel to another galaxy, the Asgard home galaxy. A second download of the Ancients' knowledge into his brain during the season 7 finale, allows him to lead SG-1 to an Ancient outpost in Antarctica. O'Neill possesses the ATA gene, and thus is able to operate the Ancient control chair and save Earth from Anubis' fleet. With the Ancient knowledge about to overwhelm his personality and kill him, he is placed into a stasis pod in the outpost until Thor of the Asgard is able to remove the knowledge and save his life. After that event, O'Neill is promoted to brigadier general and is given command of Stargate Command. O'Neill is promoted again off-screen and becomes the new head of the Department of Homeworld Security with Major General Hank Landry taking his position as the new commander of Stargate Command.

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