| Movie | 1966 | Duel at Diablo | Willard Grange | |
| Movie | 1958 | Touch of Evil | Mirador Motel Night Manager | |
| Movie | 1971 | Duel | David Mann | |
| Movie | 1953 | The Golden Blade | | |
| Movie | 1971 | What's the Matter with Helen? | Lincoln Palmer | |
| Movie | 1952 | Horizons West | Dandy Taylor | |
| Movie | 1955 | Ten Wanted Men | Sheriff Clyde Gibbons | |
| Movie | 2000 | High Noon | Mart Howe | |
| Movie | 1983 | Cocaine: One Man's Seduction | Eddie Gant | |
| Movie | 1970 | A Man Called Sledge | Erwin Ward | |
| Movie | 1955 | Storm Fear | Hank | |
| Movie | 1982 | Don't Go to Sleep | Phillip | |
| Movie | 2000 | Submerged | Buck Stevens | |
| Movie | 1966 | Way... Way Out | Hoffman | |
| Movie | 1952 | The Lawless Breed | Jim Clements | |
| Movie | 1954 | Dangerous Mission | Ranger clerk | |
| Movie | 1978 | Ishi: The Last of His Tribe | Prof. Benjamin Fuller | |
| Movie | 1973 | Terror on the Beach | Neil Glynn | |
| Movie | 1953 | Column South | Menguito | |
| Movie | 1953 | The Mississippi Gambler | Julian Contant | |
| Movie | 1988 | Disaster at Silo 7 | Sheriff Ben Harlen | |
| Movie | 1986 | A Winner Never Quits | Mr. Wyshner | |
| Movie | 2000 | The Virginian | Sam Balaam | |
| Movie | 1971 | The Forgotten Man | Lt. Joe Hardy | |
| Movie | 1973 | Female Artillery | Deke Chambers | |
| Movie | 1972 | Rolling Man | Lonnie McAfee | |
| Movie | 1970 | Swing Out, Sweet Land | Self | |
| Movie | 1985 | Going for the Gold: The Bill Johnson Story | Wally Johnson | |
| Movie | 1954 | Dragnet | Capt. R.A. Lohrman | |
| Movie | 1997 | Seduction in a Small Town | Sam Jenks | |
| Movie | 1980 | Amber Waves | Elroy 'Bud' Burkhardt | |
| Movie | 1953 | Law and Order | Frank Durling | |
| Movie | 1980 | The Ordeal of Dr. Mudd | Dr. Samuel A. Mudd | |
| Movie | 1979 | Stone | Daniel Ellis Stone | |
| Movie | 1989 | The Return of Sam McCloud | Sam McCloud | |
| Movie | 1967 | Gentle Giant | Tom Wedloe | |
| Movie | 1953 | War Arrow | Pino | |
| Movie | 1978 | The Islander | Gable McQueen | |
| Movie | 1995 | Two Bits & Pepper | Sheriff Pratt | |
| Movie | 1960 | The Gallant Hours | Andy Lowe | |
| Movie | 1977 | Intimate Strangers | Donald Halston | |
| Movie | 1988 | Walking After Midnight | Self | |
| Movie | 1979 | The Ordeal of Patty Hearst | Charles Bates | |
| Movie | 1990 | Dennis Weaver's Earthship | | |
| Movie | 1987 | Bluffing It | Jack Duggan | |
| Movie | 1997 | Stolen Women, Captured Hearts | Captain Farnsworth | |
| Movie | 1979 | A Cry For Justice | Sgt. Ted Bentley | |
| Movie | 1968 | The Dean Martin Christmas Show | Self | |
| Movie | 1955 | Seven Angry Men | John Brown Jr. | |
| Movie | 1953 | The Redhead from Wyoming | Matt Jessup | |
| Movie | 1992 | Mastergate | Vice President Dale Burden | |
| Movie | 1998 | Escape from Wildcat Canyon | Grandpa Flint | |
| Movie | 1955 | Chief Crazy Horse | Maj. Carlisle | |
| Movie | 2004 | Home on the Range | Abner (voice) | |
| Movie | 1981 | The Day the Loving Stopped | Aaron Danner | |
| Movie | 1994 | Greyhounds | Chance Wayne | |
| Movie | 1966 | Gallegher Goes West | George Tucker, the Sundown Kid | |
| Movie | 1992 | Earth and the American Dream | Reader (voice) | |
| Movie | 1972 | The Great Man's Whiskers | Abraham Lincoln | |
| Movie | 1968 | Mission Batangas | Chip Corbett | |
| Movie | 1990 | Great Adventurers & Their Quests: Indiana Jones and the Last Crusade | Narrator | |
| Movie | 1953 | The Man from the Alamo | Tennessean (uncredited) | |
| Movie | 1986 | Amy Grant: Headin' Home for the Holidays | Tom Miller | |
| TV Show | 1980 | Magnum, P.I. | Lacy Fletcher | 1 |
| TV Show | 1989 | The Simpsons | Buck McCoy (voice) | 1 |
| TV Show | 1971 | The Sonny & Cher Comedy Hour | | 1 |
| TV Show | 1966 | That Girl | | 1 |
| TV Show | 1962 | The Merv Griffin Show | Self | 1 |
| TV Show | 2005 | Wildfire | Henry Ritter | 12 |
| TV Show | 1955 | Gunsmoke | Chester | 341 |
| TV Show | 1996 | E! True Hollywood Story | | 1 |
| TV Show | 1951 | Dragnet | | 4 |
| TV Show | 1962 | Combat! | Noah | 1 |
| TV Show | 1948 | The Ed Sullivan Show | Self | 1 |
| TV Show | 1978 | Centennial | R.J. Poteet | 12 |
| TV Show | 1959 | The Twilight Zone | Adam Grant | 1 |
| TV Show | 1955 | Alfred Hitchcock Presents | Charles Cavender | 1 |
| TV Show | 1973 | Police Story | | 1 |
| TV Show | 1999 | Family Law | Judge Richard Lloyd | 1 |
| TV Show | 1970 | The Don Knotts Show | Self | 1 |
| TV Show | 1970 | McCloud | Sam McCloud | 46 |
| TV Show | 1983 | Emerald Point N.A.S. | Rear Adm. Thomas Mallory | 22 |
| TV Show | 1951 | Schlitz Playhouse of Stars | Ben | 1 |
| TV Show | 1954 | Climax! | Steve Maclyn | 1 |
| TV Show | 1967 | Judd for the Defense | | 1 |
| TV Show | 1987 | Buck James | Dr. Buck James | 19 |
| TV Show | 1994 | Lonesome Dove: The Series | Buffalo Bill Cody | 21 |
| TV Show | 1961 | Dr. Kildare | Wayne Wandemeir | 1 |
| TV Show | 1964 | Kentucky Jones | Kentucky Jones | 26 |
| TV Show | 1980 | Stone | Det. Sgt. Daniel Stone | 9 |
| TV Show | 1975 | Cher | Self - Guest | 1 |
| TV Show | 1967 | Gentle Ben | Tom Wedloe | 56 |
| TV Show | 1961 | The Mike Douglas Show | Self - Co-Host | 1 |
| TV Show | 1973 | The American Film Institute Salute to ... | Self | 1 |
| TV Show | 1978 | Pearl | Col. Jason Forrest | 3 |
| TV Show | 1961 | The Mike Douglas Show | Self | 3 |
| TV Show | 1968 | The Name of the Game | Walter Grayson | 1 |
| TV Show | 1951 | Dragnet | Russ Camp | 1 |
| TV Show | 1990 | Captain Planet and the Planeteers | | 1 |
| TV Show | 1962 | The Tonight Show Starring Johnny Carson | Self | 7 |
| TV Show | 1971 | The Pet Set | Self | 1 |
| TV Show | 1994 | Touched by an Angel | Emmett Rivers | 1 |
| TV Show | 1977 | The Hardy Boys / Nancy Drew Mysteries | Self | 1 |