| Movie | 1952 | High Noon | Sam Fuller | |
| Movie | 1987 | Dragnet | Captain Gannon | |
| Movie | 1960 | Inherit the Wind | Judge Mel | |
| Movie | 1971 | The Barefoot Executive | E.J. Crampton | |
| Movie | 1980 | Roughnecks | Plug Champion | |
| Movie | 1948 | Yellow Sky | Half Pint | |
| Movie | 1969 | Support Your Local Sheriff! | Olly Perkins | |
| Movie | 1979 | The Apple Dumpling Gang Rides Again | T.P. Gaskill | |
| Movie | 1978 | Maneaters Are Loose! | Toby Waites | |
| Movie | 1949 | Holiday Affair | Police Lieutenant (as Henry Morgan) | |
| Movie | 1962 | How the West Was Won | Gen. Ulysses S. Grant | |
| Movie | 1972 | Snowball Express | Jesse McCord | |
| Movie | 1950 | Appointment with Danger | George Soderquist | |
| Movie | 1946 | Dragonwyck | Klaas Bleecker | |
| Movie | 1947 | The Gangster | Shorty | |
| Movie | 1976 | The Shootist | Marshall Thibido | |
| Movie | 1949 | Red Light | Rocky | |
| Movie | 1952 | Scandal Sheet | Biddle | |
| Movie | 1982 | The Flight of Dragons | Carolinus (voice) | |
| Movie | 1945 | State Fair | Barker | |
| Movie | 1948 | Moonrise | Billy Scripture | |
| Movie | 1951 | The Well | Claude Packard | |
| Movie | 1949 | Strange Bargain | Richard Webb | |
| Movie | 1966 | What Did You Do in the War, Daddy? | Major Pott | |
| Movie | 1950 | Dark City | Soldier | |
| Movie | 1967 | The Flim-Flam Man | Sheriff Slade | |
| Movie | 1953 | Thunder Bay | Rawlings | |
| Movie | 1956 | Backlash | Tony Welker | |
| Movie | 1955 | Strategic Air Command | Sergeant Bible | |
| Movie | 1952 | My Six Convicts | Dawson | |
| Movie | 1948 | All My Sons | Frank Lubey | |
| Movie | 1949 | Madame Bovary | Hyppolite | |
| Movie | 1952 | Bend of the River | Shorty | |
| Movie | 1960 | Cimarron | Jessie Rickey | |
| Movie | 1969 | Viva Max! | Chief of Police Sylvester | |
| Movie | 1954 | The Glenn Miller Story | Chummy MacGregor | |
| Movie | 1975 | The Apple Dumpling Gang | Homer McCoy | |
| Movie | 1966 | Frankie and Johnny | Cully | |
| Movie | 1954 | The Far Country | Ketchum | |
| Movie | 1971 | Support Your Local Gunfighter | Taylor | |
| Movie | 1978 | The Cat from Outer Space | General Stilton | |
| Movie | 1944 | Wing and a Prayer | Malcolm Brainard | |
| Movie | 1948 | The Big Clock | Bill Womack | |
| Movie | 1982 | Showbiz Goes to War | (archive footage) | |
| Movie | 2004 | Los Angeles Plays Itself | Officer Bill Gannon in Dragnet (archive footage) | |
| Movie | 1994 | Incident in a Small Town | Judge Bell | |
| Movie | 1948 | Race Street | Hal Towers | |
| Movie | 1943 | Crash Dive | Brownie | |
| Movie | 1974 | Sidekicks | Sheriff Jenkins | |
| Movie | 1942 | To the Shores of Tripoli | Mouthy | |
| Movie | 1979 | The Wild Wild West Revisited | Robert T. Malone | |
| Movie | 1952 | Stop, You're Killing Me | Innocence | |
| Movie | 1950 | The Showdown | Rod Main | |
| Movie | 1960 | The Mountain Road | Mike Michaelson | |
| Movie | 1973 | Charley and the Angel | Angel | |
| Movie | 1971 | Scandalous John | Sheriff Pippin | |
| Movie | 1954 | About Mrs. Leslie | Fred Blue | |
| Movie | 1953 | Arena | Lew Hutchins | |
| Movie | 1952 | Apache War Smoke | Ed Cotten | |
| Movie | 1956 | Star in the Dust | Lew Hogan | |
| Movie | 1951 | The Blue Veil | Charles Hall | |
| Movie | 1944 | Roger Touhy, Gangster | Thomas "Smoke" Reardon | |
| Movie | 1948 | The Saxon Charm | Hermy | |
| Movie | 1946 | From This Day Forward | Hank Beesley | |
| Movie | 1949 | Hello Out There | The Young Gambler | |
| Movie | 1949 | Down to the Sea in Ships | Britton | |
| Movie | 1946 | It Shouldn't Happen to a Dog | Gus Rivers | |
| Movie | 1952 | Boots Malone | Quarter Horse Henry | |
| Movie | 1959 | It Started with a Kiss | Charles Meriden | |
| Movie | 1954 | Prisoner of War | Maj. O.D. Hale | |
| Movie | 1952 | Toughest Man in Arizona | Verne Kimber | |
| Movie | 1972 | The Century Turns | Doc Amos B. Coogan | |
| Movie | 1978 | Confessions of the D.A. Man | H.M. 'Staff' Stafford | |
| Movie | 1943 | Happy Land | Tony Cavrek (as Henry Morgan) | |
| Movie | 1944 | The Eve of St. Mark | Private Shevlin | |
| Movie | 1943 | The Ox-Bow Incident | Art Croft | |
| Movie | 1954 | The Forty-Niners | Alf Billings | |
| Movie | 1950 | Outside the Wall | Garth | |
| Movie | 1978 | The Bastard | Capt. Caleb | |
| Movie | 1944 | Gentle Annie | Cottonwood Goss (as Henry Morgan) | |
| Movie | 1979 | You Can't Take it With You | Mr. DePinna | |
| Movie | 1981 | Rivkin: Bounty Hunter | Father Everett Kolodny | |
| Movie | 1971 | The Feminist and the Fuzz | Horace Bowers | |
| Movie | 1955 | Not as a Stranger | Oley | |
| Movie | 1952 | The Devil and John Q | Abe Lincoln | |
| Movie | 1965 | John Goldfarb, Please Come Home! | Sarajevo | |
| Movie | 1977 | Exo-Man | Arthur Travis | |
| Movie | 1980 | Scout's Honor | Mr. Briggs | |
| Movie | 1946 | Somewhere in the Night | Bath Attendant | |
| Movie | 1951 | Belle Le Grand | Abel Stone | |
| Movie | 1978 | Kate Bliss and the Ticker Tape Kid | Hugo Peavey | |
| Movie | 1942 | The Omaha Trail | Henchman Nat | |
| Movie | 2013 | Greenboy: Prescription for Death | Bill Gannon (archive footage) | |
| Movie | 1942 | Orchestra Wives | Cully Anderson | |
| Movie | 1953 | Torch Song | Joe Denner | |
| Movie | 1978 | Murder at the Mardi Gras | Jim Bob Jackson | |
| Movie | 1942 | The Loves of Edgar Allan Poe | Ebenezer Burling | |
| Movie | 1980 | More Wild Wild West | Robert T. 'Skinny' Malone | |
| Movie | 1975 | The Last Day | Narrator | |
| Movie | 2002 | M*A*S*H: 30th Anniversary Reunion | Himself | |
| Movie | 1952 | What Price Glory | Sergeant Moran | |
| Movie | 1951 | When I Grow Up | Father Reed (Modern) | |
| Movie | 1957 | The Teahouse of the August Moon | Sergeant Gregovich | |
| Movie | 1990 | The Incident | Judge Bell | |
| Movie | 1992 | Against Her Will: An Incident in Baltimore | Judge Stoddard Bell | |
| Movie | 1953 | Champ for a Day | Al Muntz | |
| Movie | 1944 | Take It or Leave It | (archive footage) (uncredited) | |
| Movie | 1969 | Dragnet | Bill Gannon | |
| Movie | 1988 | 14 Going on 30 | Uncle Herb | |
| Movie | 1991 | Memories of M*A*S*H | Self / Sherman Potter | |
| Movie | 1933 | The Kennel Murder Case | Gamble (uncredited) | |
| Movie | 1945 | A Bell for Adano | Capt. N. Purvis | |
| Movie | 1979 | Better Late Than Never | Mr. Scott | |
| Movie | 2001 | The Shootist: The Legend Lives On | Self (archive footage) (uncredited) | |
| Movie | 1983 | Sparkling Cyanide | Captain Kemp | |
| Movie | 1957 | Under Fire | Sgt. Joseph C. Dusak | |
| Movie | 1997 | Family Plan | Sol Rubins | |
| Movie | 1946 | Johnny Comes Flying Home | Joe Patillo | |
| Movie | 1971 | Cat Ballou | The Rancher | |
| Movie | 1970 | But I Don't Want to Get Married! | Mr. Good | |
| Movie | 1968 | Star Spangled Salesman | TV Cop | |
| Movie | 1971 | Ellery Queen: Don't Look Behind You | Insp. Richard Queen | |
| Movie | 1956 | Operation Teahouse | Self | |
| Movie | 1951 | The Highwayman | | |
| TV Show | 1984 | Murder, She Wrote | Retired Lt. Richard Webb | 1 |
| TV Show | 1989 | The Simpsons | Bill Gannon (voice) | 1 |
| TV Show | 1972 | M*A*S*H | General Steele | 1 |
| TV Show | 1972 | M*A*S*H | Sherman Potter | 179 |
| TV Show | 1992 | Renegade | | 1 |
| TV Show | 1954 | December Bride | Pete Porter | 157 |
| TV Show | 1977 | The Love Boat | Wendell Snead | 1 |
| TV Show | 1985 | The Twilight Zone | | 1 |
| TV Show | 1993 | Grace Under Fire | | 1 |
| TV Show | 1962 | Ensign O'Toole | Charlie | 1 |
| TV Show | 1983 | AfterMASH | Sherman T. Potter | 31 |
| TV Show | 1955 | Gunsmoke | Osgood Pickett | 1 |
| TV Show | 1970 | Night Gallery | Thaddeus Conway | 1 |
| TV Show | 1979 | Backstairs at the White House | Pres. Harry S. Truman | 4 |
| TV Show | 1972 | Hec Ramsey | Doc Amos Coogan | 11 |
| TV Show | 1955 | Alfred Hitchcock Presents | Hermie Jenkins | 1 |
| TV Show | 1962 | Going My Way | | 1 |
| TV Show | 1965 | The Wackiest Ship in the Army | | 1 |
| TV Show | 1995 | The Jeff Foxworthy Show | | 1 |
| TV Show | 1962 | The Virginian | Kendall Jones | 1 |
| TV Show | 1971 | The D.A. | H.M. 'Staff' Stafford | 15 |
| TV Show | 1960 | Pete and Gladys | | 72 |
| TV Show | 1979 | Roots: The Next Generations | Bob Campbell | 7 |
| TV Show | 1963 | The Richard Boone Show | | 15 |
| TV Show | 1952 | Cavalcade of America | Homer Byington | 1 |
| TV Show | 1986 | Blacke's Magic | Leonard Blacke | 13 |
| TV Show | 1951 | The Amazing Mr. Malone | | 1 |
| TV Show | 1960 | Here's Hollywood | | 1 |
| TV Show | 1961 | Dr. Kildare | Francis X. Healy | 3 |
| TV Show | 1964 | Kentucky Jones | Seldom Jackson | 26 |
| TV Show | 1999 | Love & Money | | 1 |
| TV Show | 1967 | Dragnet | Officer Bill Gannon | 98 |
| TV Show | 1955 | The 20th Century Fox Hour | Mike Feeney | 1 |
| TV Show | 1955 | Gunsmoke | John Milligan | 1 |
| TV Show | 1955 | Gunsmoke | Jed Hockett | 2 |
| TV Show | 1969 | Love, American Style | Woody | 1 |
| TV Show | 1996 | 3rd Rock from the Sun | Professor Suter | 3 |
| TV Show | 1970 | The Partridge Family | Cal | 1 |
| TV Show | 1959 | The Untouchables | George 'Bugs' Moran | 1 |
| TV Show | 1974 | Dinah! | Self | 1 |
| TV Show | 1970 | The Partridge Family | Willie Larkin | 1 |
| TV Show | 1977 | The Love Boat | Charly Fields | 2 |
| TV Show | 1957 | Have Gun, Will Travel | Sheriff Ernie Backwater | 1 |
| TV Show | 1957 | Have Gun, Will Travel | Fred Braus | 1 |
| TV Show | 1977 | The Love Boat | Milo Endler | 2 |
| TV Show | 1954 | The Lone Wolf | Jim Strait | 1 |
| TV Show | 1954 | The Lone Wolf | Rev. Jeffrey Hallam | 1 |
