As of July 2026, Mark Harmon is best known for NCIS and The West Wing. Find every show and movie Mark Harmon has starred in — and where to watch them — below.
Mark Harmon

Mark Harmon

Actor Born 1951 Burbank, California, USA 12 TV Shows 8 Movies

Thomas Mark Harmon (born September 2, 1951) is an American actor, producer and director. He is known for playing the lead role of Leroy Jethro Gibbs on NCIS (2003-2021), a role which has earned him six nominations at the People's Choice Awards including a win for Favorite TV Crime Drama Actor in 2017. Since 2008, he has also been a producer and executive producer of the show as well as its' spinoff series NCIS: New Orleans. His character of NCIS special agent Leroy Jethro Gibbs was introduced in a guest starring role in two episodes of JAG, and continued on the spinoff show NCIS.

He had a recurring role as Secret Service special agent Simon Donovan in a four-episode story arc in The West Wing in 2002, for which he received an Emmy Award nomination.

One of his first national TV appearances (other than as an athlete) was in a commercial for Kellogg's Product 19 cereal with his father, Tom Harmon, its longstanding TV spokesman. Thanks to his sister Kristin's in-laws, Ozzie and Harriet Nelson, he landed his first job as an actor in an episode of Ozzie's Girls.

He has been starring in television and film since the mid-1970s, after a career as a collegiate football player with the UCLA Bruins.

He's been married to actress Pam Dawber since 1987 and they have 2 sons. His son, actor Sean Harmon, had a recurring role as a young Leeroy Jethro Gibbs on NCIS.

Alongside acting, Mark Harmon is also known as a director, producer. His screen credits lean toward Drama and Comedy.

Mark Harmon's most notable role to date came in Fear and Loathing in Las Vegas (1998), where he played Magazine Reporter. He also appeared in Freaky Friday (2003) as Ryan. Most recently appeared in Natural Born Killers (1994) as Mickey Knox in TV.

Fans wanting to catch up on Mark Harmon's work can find exactly where his shows and movies are streaming below — and TV Butler Pro makes it effortless to keep track of them all. Just search the title, and Butler finds it instantly, tells you which service has it, and remembers what you've already watched.

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📺 Mark Harmon's TV Shows

NCIS
Leroy Jethro Gibbs
2003
The West Wing
Simon Donovan
1999
JAG
Leroy Jethro Gibbs
1995
The Love Boat
Doug Bradbury
1977
NCIS: New Orleans
Leroy Jethro Gibbs
2014
Chicago Hope
Jack McNeil
1994
St. Elsewhere
Robert Caldwell
1982
Moonlighting
Sam Crawford
1985
NCIS: Origins
Older Leroy Jethro Gibbs (voice) (uncredited)
2024
Flamingo Road
Field Carlyle
1981
Centennial
Captain John McIntosh
1978
Goliath Awaits
Peter Cabot
1981

🎬 Mark Harmon's Movies

Freakier Friday
Ryan
2025
Natural Born Killers
Mickey Knox in TV
1994
Fear and Loathing in Las Vegas
Magazine Reporter
1998
Freaky Friday
Ryan
2003
Wyatt Earp
Sheriff Johnny Behan
1994
Local Boys
Jim Wesley
2002
Weather Girl
Dale
2009
Chasing Liberty
James Foster
2004

📝 Created / Written by Mark Harmon

Boston Public
Director
2000
Certain Prey
Executive Producer
2011

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