| Year | Title | Role | Other notes |
|---|
| | Ozzie's Girls | The Candidate |
| | Emergency! | Officer Dave Gordon | Episode: "Wild" |
| Adam | Officer Gus Corbin | Episode: "Gus Corbin" |
| Police Woman | Paul Donin | Episode: "No Place to Hide" |
| | Laverne & Shirley | Victor, Jeep Buyer | Episode: "Dating Slump" |
| All's Fair | Episode: "Jealousy" |
| Police Woman | Stansky | Episode: "Tender Soldier" |
| Delvecchio | Ronnie Striker | Episode: "Hot Spell" |
| | Eleanor and Franklin: The White House Years | Robert Dunlap | TV movie
Nominated - Primetime Emmy Award for Outstanding Supporting Actor – Miniseries or a Movie |
| The Hardy Boys/Nancy Drew Mysteries | Chip Garvey | Episode: "Mystery of the Solid Gold Kicker" |
| | Sam | Officer Mike Breen | 7 episodes |
| Getting Married | Howie Lesser | TV movie |
| Little Mo | Norman Brinker | TV movie |
| Comes a Horseman | Billy Joe Meynert |
| | Centennial | Captain John McIntosh | 3 episodes |
| | Beyond the Poseidon Adventure | Larry Simpson |
| | The Love Boat | Doug Bradbury | 3 episodes |
| | Robert | Deputy Dwayne "Thib" Thibideaux | Main character, 13 episodes |
| | Flamingo Road | Fielding "Field" Carlyle | TV movie |
| The Dream Merchants | Johnny Edge |
| | Goliath Awaits | Peter Cabot | TV movie |
| | Flamingo Road | Fielding "Field" Carlyle | Main character, 37 episodes |
| | Doctor in Paradise | Tommy |
| | St.Biography mark harmon wikipedia deutsch Born in California in , Mark Harmon is best known for playing a doctor on the long-running show St. More recently, he's become known for several roles in television movies. His father, Tom Harmon, worked as a sports broadcaster. This meant that he often traveled, leaving his wife Elyse Knox, a former actress, to look after the couple's three children. Mark deeply felt his father's absence. Elsewhere | Dr. Robert Caldwell | Main character, 70 episodes |
| | Desert Warrior | Gacel Sayah |
| | Prince of Bel Air | Robin Prince | TV movie |
| The Deliberate Stranger | Ted Bundy | TV movie
Nominated - Golden Globe Award for Best Actor – Miniseries or Television Film |
| Let's Get Harry | Harry Burck, Jr.
|
| | Moonlighting | Sam Crawford | 4 episodes |
| Summer School | Freddy Shoop |
| After the Promise | Elmer Jackson | TV movie
Nominated - Golden Globe Award for Best Actor – Miniseries or Television Film |
| | The Presidio | Jay Austin |
| Stealing Home | Billy Wyatt |
| | Sweet Bird of Youth | Chance Wayne | TV movie |
| Worth Winning | Taylor Worth |
| | Till There Was You | Frank Flynn |
| Kenny Rogers Classic Weekend | Himself |
| | Dillinger | John Dillinger |
| Fourth Story | David Shepard | TV movie |
| Long Road Home | Ertie Robertson | TV movie |
| Shadow of a Doubt | Uncle Charlie Oakley |
| Cold Heaven | Alex Davenport |
| | Reasonable Doubts | Detective Dicky Cobb | Main character, 45 episodes
Nominated - Golden Globe Award for Best Actor – Television Series Drama ()
Nominated - Golden Globe Award for Best Actor – Television Series Drama () |
| | Harts of the West | Rodeo clown | Episode: "The Right Stuff" |
| | Natural Born Killers | Uncredited |
| | Original Sins | Johnathan Franye | TV movie |
| Magic in the Water | Jack Black |
| The Last Supper | Dominant Male |
| Charlie Grace | Charlie Grace | Main character, 6 episodes |
| | Strangers | Mark | Episode: "Visit" |
| | Chicago Hope | Dr.
Jack McNeil | Main character, 95 episodes
Nominated - Screen Actors Guild Award for Outstanding Performance by an Ensemble in a Drama Series ()
Nominated - Screen Actors Guild Award for Outstanding Performance by an Ensemble in a Drama Series ()
Nominated - Screen Actors Guild Award for Outstanding Performance by an Ensemble in a Drama Series ()
Nominated - Screen Actors Guild Award for Outstanding Performance by an Ensemble in a Drama Series () |
| | Adventures from the Book of Virtues | Ulysses | Episode: "Perseverance" |
| Casualties | Tommy Nance |
| The First to Go | Jeremy Hampton |
| | From the Earth to the Moon | Wally Schirra | 2 episodes |
| Fear and Loathing in Las Vegas | Magazine Reporter at Mint |
| | I'll Remember April | John Cooper |
| | For All Time | Charles Lattimer |
| The Amati Girls | Lawrence |
| | Crossfire Trail | Bruce Barkow |
| And Never Let Her Go | Thomas Capano | TV movie |
| The Legend of Tarzan | Bob Markham (voice) | Episode: "Tarzan and the Outbreak" |
| | Local Boys | Jim Wesley |
| The West Wing | Special Agent Simon Donovan | 4 episodes
Nominated - Primetime Emmy Award for Outstanding Guest Actor - Drama Series |
| | JAG | Special Agent Leroy Jethro Gibbs | 2 episodes (NCIS pilot episodes) |
| Freaky Friday | Ryan |
| | NCIS | Special Agent Leroy Jethro Gibbs | Current main character, every episode |
| | Chasing Liberty | President James Foster |
| | Weather Girl | Dale |
| | Justice League: Crisis on Two Earths | Superman (voice) | Filming |