From Wikipedia, the free encyclopedia. Mark Harmon (born September 2, 1951) is an American actor who has been starring in U.S. television programs and films since the mid-1970s, after a career as a collegiate football player with the UCLA Bruins. Since 2003, Harmon has starred as Leroy Jethro Gibbs in the CBS series NCIS.
| Series | The Late Late Show with James Corden | Himself | 2015-03-23 |
| Movie | Certain Prey | Lucas Davenport | 2011-11-06 |
| Movie | Justice League: Crisis on Two Earths | Superman (voice) | 2010-02-23 |
| Movie | Weather Girl | Dale | 2009-07-10 |
| Series | The Bonnie Hunt Show | Unknown | 2008-09-08 |
| Movie | Chasing Liberty | James Foster | 2004-01-09 |
| Series | Jimmy Kimmel Live! | Unknown | 2003-01-26 |
| Movie | Freaky Friday | Ryan | 2003-08-05 |
| Series | NCIS | Leroy Jethro Gibbs | 2003-09-23 |
| Movie | Local Boys | Jim Wesley | 2002-02-23 |
| Movie | The Amati Girls | Lawrence | 2001-01-09 |
| Movie | Crossfire Trail | Bruce Barkow | 2001-01-21 |
| Movie | And Never Let Her Go | Thomas Capano | 2001-04-01 |
| Movie | For All Time | Charles Lattimer | 2000-10-18 |
| Movie | Fear and Loathing in Las Vegas | Magazine Reporter | 1998-05-22 |
| Movie | The First to Go | Jeremy Hampton | 1997-01-01 |
| Series | The View | Unknown | 1997-08-11 |
| Movie | Casualties | Tommy Nance | 1997-04-15 |
| Series | Strangers | Unknown | 1996-04-19 |
| Series | The Rosie O'Donnell Show | Unknown | 1996-06-10 |
| Movie | Original Sins | Johnathan Franye | 1995-04-12 |
| Movie | Magic in the Water | Jack Black | 1995-08-30 |
| Series | JAG | Unknown | 1995-09-23 |
| Movie | The Last Supper | Dominant Male | 1995-09-08 |
| Movie | Wyatt Earp | Sheriff Johnny Behan | 1994-06-24 |
| Series | Chicago Hope | Dr. Jack McNeil | 1994-09-18 |
| Movie | Natural Born Killers | Mickey Knox in TV | 1994-08-26 |
| Series | The Tonight Show with Jay Leno | Unknown | 1992-05-25 |
| Movie | Cold Heaven | Alex Davenport | 1992-05-29 |
| Movie | Fourth Story | David Shepard | 1991-01-19 |
| Movie | Dillinger | John Dillinger | 1991-01-06 |
| Movie | Long Road Home | Ertie Robertson | 1991-02-25 |
| Movie | Till There Was You | Frank Flynn | 1991-07-18 |
| Series | Reasonable Doubts | 1991-09-26 | |
| Movie | Shadow of a Doubt | Charles Spencer | 1991-04-27 |
| Movie | Sweet Bird of Youth | Chance Wayne | 1989-10-01 |
| Movie | Worth Winning | Taylor Worth | 1989-10-27 |
| Movie | The Presidio | Jay Austin | 1988-06-10 |
| Movie | Stealing Home | Billy Wyatt | 1988-08-26 |
| Movie | Summer School | Mr. Freddy Shoop | 1987-07-22 |
| Movie | After the Promise | Elmer Jackson | 1987-10-11 |
| Movie | Dear America: Letters Home from Vietnam | (voice) | 1987-10-01 |
| Movie | Prince of Bel Air | Robin Prince | 1986-01-20 |
| Movie | The Deliberate Stranger | Ted Bundy | 1986-05-04 |
| Movie | Let's Get Harry | Harry | 1986-10-31 |
| Movie | Tuareg: Desert Warrior | Gacel Sayah | 1984-03-12 |
| Movie | Intimate Agony | Tommy | 1983-03-21 |
| Series | St. Elsewhere | Dr. Robert Caldwell | 1982-10-26 |
| Series | Flamingo Road | 1981-01-06 | |
| Movie | Goliath Awaits | Peter Cabot | 1981-11-11 |
| Series | The Dream Merchants | Johnny Edge | 1980-05-12 |
| Series | 240-Robert | 1979-08-28 | |
| Movie | Beyond the Poseidon Adventure | Larry Simpson | 1979-05-18 |
| Movie | Getting Married | Howie Lesser | 1978-05-17 |
| Movie | Little Mo | Norman Brinker | 1978-09-05 |
| Movie | Comes a Horseman | Billy Joe Meynert | 1978-10-25 |
| Movie | Eleanor and Franklin: The White House Years | Robert Dunlap | 1977-03-13 |
| Series | The Love Boat | Unknown | 1977-09-24 |
| Series | All's Fair | Unknown | 1976-09-20 |
| Series | Saturday Night Live | Unknown | 1975-10-11 |
| Series | Ozzie's Girls | Unknown | 1973-01-01 |
| Series | Hallmark Hall of Fame | Unknown | 1951-12-24 |
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