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Leroy Jethro Gibbs (born November 21, 1954) is a fictional character and the original protagonist of the CBS TV series NCIS, portrayed by Mark Harmon in the original series and by Austin Stowell in the prequel series NCIS: Origins. He is a former U.S. Marine Corps Scout Sniper turned special agent who commands a team for the Naval Criminal Investigative Service (NCIS)

Gibbs is the most accomplished marksman on the team and the most skilled at handling violent standoffs; he depends on his other agents heavily for technical forensics and background checks. He is patient but firm with his team and has little patience for bureaucracy; he commands most other main characters—including his current staff Timothy McGee, Nick Torres and, briefly, Jessica Knight and previous staff Caitlin Todd (killed in the line of duty), Anthony DiNozzo (left to look after his newly found daughter), Ziva David (presumed as killed after leaving NCIS; later revealed to have gone into hiding), Alexandra Quinn (left to look after her sick mother), Clayton Reeves (killed while defending Abby Sciuto), Ellie Bishop (left presumably for a CIA undercover mission with Odette Malone) and Jacqueline Sloane (left to pursue humanitarian work in Afghanistan). Having found peace in Alaska for the first time since his family's death, Gibbs leaves NCIS in the 2021 episode "Great Wide Open" in search of adventure.

Since 2024, Austin Stowell has starred as a younger Gibbs in the prequel series NCIS: Origins.

Series creator Donald P. Bellisario initially did not think Mark Harmon would fit the role of Gibbs, a "flinty type with a strong sense of honor and respect for the military", but changed his mind after viewing a tape of Harmon's portrayal of a Secret Service agent on The West Wing. Co-executive producer Charles Floyd Johnson recalls, "We all looked at that work. And everybody said, 'He's Gibbs.'" The production also considered Harrison Ford, Scott Glenn, Kevin Bacon, Chris Cooper, Alec Baldwin, Val Kilmer, Clive Owen, Tom Berenger, Charlie Sheen, Aidan Quinn, and Patrick Swayze; with Glenn being strongly considered. Harmon was cast in 2003, and Bellisario explained, "I said, 'Oh, my God, he's Gibbs.' He had matured. He's good-looking in a totally different way than he was as a young guy." At another point, he said, "I am so lucky to have Mark Harmon as the lead. You have no idea. This cast is gold. Mark Harmon is a Middle American guy, even if he was raised in Southern California. His values are exactly the same as mine."

In the backstory, Gibbs was born on November 21, 1954, and was shown in the episode "Heartland" to have grown up in Stillwater, Pennsylvania. His father, Jackson Gibbs, owned and ran the Stillwater General Store. Gibbs' mother died of suicide when he was 14, driven by a diagnosis of cancer. Gibbs is described as a teenage delinquent before joining the Marine Corps. Gibbs is described as serving in Panama and in the Gulf War. Leaving the Marines in the early 1990s, Gibbs joins NCIS. The character is mentored by Mike Franks before becoming the head of his own NCIS team, which he leads for most of the series.

Gibbs is a highly skilled marksman with both his agency-issued SIG Sauer P228 pistol (which he replaces with a .45 Colt M1911A1 pistol in Season 15) and M40A1 sniper rifle.

In the season 7 premiere, "Truth or Consequences", he kills the terrorists holding his team hostage from an exceptionally long distance and in "South by Southwest" he outshoots a professional hit-man in an approaching helicopter. His knowledge of the Marine Corps and training as a sniper often comes into use, as shown in the episodes "Ravenous", "Vanished" and "Twenty Klicks" where he uses his wilderness tracking skills and marksmanship to aid the investigation and/or get the team out of trouble.

Gibbs is a private man of few words who discloses little to nothing about his personal life. He avoids discussing his life or past before he joined NCIS, especially to agents and co-workers under him, which leads to his team members constantly speculating over his private life. Aside from his tendency to use military slang, he rarely mentions or speaks at length about his time in the Marine Corps although he is often referred to as "Gunny" by Navy and Marine officers, occasionally dons a "USMC" hoodie or T-shirt when off duty and has a replica of the iconic Raising the Flag on Iwo Jima photograph framed and mounted above the fireplace in his home.

In the season 6 episode "Heartland", Gibbs' frosty relationship with his father Jackson and the backstory behind it is revealed. His father had rarely been mentioned up to that point and Jackson had n