Acting credits
96
Prolific
Very extensive acting filmography.
Actor
Mark Harmon
Acting
Career Snapshot
ExplainedThese indicators come from TMDB. They are relative signals, not review ratings.
TMDB popularity
2.0
Low visibility
TMDB internal trend index. Higher usually means more searches and page activity now.
Movies: 46Series: 51Crew credits: 7
TMDB ID: 19728
IMDb ID: nm0001319
Known for: Acting
Born: September 2, 1951
Age: 74
Place of birth: Burbank, California, USA
Gender: Male
Adult content flag: No
Career span: 1944 - 2025
Years active: 82
Average TMDB rating: 6.57
Wikidata: Q296774
Also known as
Thomas Mark Harmon
Other jobs
Executive Producer (4)Director (2)Producer (1)
Biography
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.
Photos
Movies
Movies
Movie credits linked with Mark Harmon.
as Ryan
Freakier Friday
2025 • Movie
as Self
NCISverse: The First 1,000
2024 • Movie
as Self
The Wild
2019 • Movie
as Lucas Davenport
Certain Prey
2011 • Movie
as Superman (voice)
Justice League: Crisis on Two Earths
2010 • Movie
as Dale
Weather Girl
2009 • Movie
as James Foster
Chasing Liberty
2004 • Movie
as Ryan
Freaky Friday
2003 • Movie
as Jim Wesley
Local Boys
2002 • Movie
as Thomas Capano
And Never Let Her Go
2001 • Movie
as Bruce Barkow
Crossfire Trail
2001 • Movie
as Lawrence
The Amati Girls
2001 • Movie
as Charles Lattimer
For All Time
2000 • Movie
as John Cooper
I'll Remember April
1999 • Movie
as Magazine Reporter
Fear and Loathing in Las Vegas
1998 • Movie
as Tommy Nance
Casualties
1997 • Movie
as Jeremy Hampton
The First to Go
1997 • Movie
as Dominant Male
The Last Supper
1995 • Movie
as Jack Black
Magic in the Water
1995 • Movie
as Johnathan Franye
Original Sins
1995 • Movie
as Mickey Knox in TV
Natural Born Killers
1994 • Movie
as Sheriff Johnny Behan
Wyatt Earp
1994 • Movie
as Alex Davenport
Cold Heaven
1992 • Movie
as Frank Flynn
Till There Was You
1991 • Movie
Series
Series
Series credits linked with Mark Harmon.
as Older Leroy Jethro Gibbs (voice) (uncredited) • 16 eps
NCIS: Origins
2024 • Series
as Ira Monroe • 65 eps
Black Tar
2022 • Series
as Self - Narrator (voice) • 6 eps
Joe Montana: Cool Under Pressure
2022 • Series
as Self • 1 eps
The Kelly Clarkson Show
2019 • Series
as Narrator (voice) • 8 eps
All or Nothing: The Michigan Wolverines
2018 • Series
as Self • 8 eps
The American West
2016 • Series
as Self - Guest • 1 eps
The Late Show with Stephen Colbert
2015 • Series
as Self • 1 eps
The Late Late Show with James Corden
2015 • Series
as Leroy Jethro Gibbs • 4 eps
NCIS: New Orleans
2014 • Series
as Self • 1 eps
The Arsenio Hall Show
2013 • Series
as Self • 1 eps
The Bonnie Hunt Show
2008 • Series
as Self - Guest • 1 eps
The Megan Mullally Show
2006 • Series
as Leroy Jethro Gibbs • 435 eps
NCIS
2003 • Series
as Self • 1 eps
Jimmy Kimmel Live!
2003 • Series
as Bob Markham (voice) • 1 eps
The Legend of Tarzan
2001 • Series
as Thomas Capano • 2 eps
And Never Let Her Go
2001 • Series
Director • 2 eps
Boston Public
2000 • Series
as Simon Donovan • 4 eps
The West Wing
1999 • Series
as Leroy Jethro Gibbs (voice) • 1 eps
Family Guy
1999 • Series
as Wally Schirra • 1 eps
From the Earth to the Moon
1998 • Series
as Self • 1 eps
The View
1997 • Series
as Self • 1 eps
The Rosie O'Donnell Show
1996 • Series
as Mark • 1 eps
Strangers
1996 • Series
as Leroy Jethro Gibbs • 2 eps
JAG
1995 • Series