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| Title | Year | Status | Character |
|---|
| Steve Canyon | 1958 | TV Series | Colonel Hampton |
| The Buccaneer | 1958 | Capt. Brown |
| Walt Disney's Wonderful World of Color | 1958 | TV Series | Deputy Marshal Ed Morgan |
| Gunman's Walk | 1958 | Sheriff Harry Brill |
| Mike Hammer | 1958 | TV Series | Eugene T. Oland |
| Schlitz Playhouse | 1958 | TV Series | Captain Gideon / Harry Lewis |
| Man Without a Gun | 1958 | TV Series | Hamish Sr. |
| Playhouse 90 | 1957-1958 | TV Series | General Strayer / Sam / Joe Green / ... |
| Climax! | 1954-1958 | TV Series |
| General Electric Theater | 1958 | TV Series | Captain Woods |
| M Squad | 1957 | TV Series | Simmons |
| The Millionaire | 1957 | TV Series | Dan Carson |
| The Web | 1957 | TV Series |
| Matinee Theatre | 1957 | TV Series |
| The United States Steel Hour | 1957 | TV Series | Jeff |
| The Alcoa Hour | 1957 | TV Series | Mr. Price |
| Broken Arrow | 1957 | TV Series | General Everitt |
| Spring Reunion | 1957 | Harry Brewster |
| Edge of the City | 1957 | George Nordmann (as Robert Simon) |
| Crusader | 1956 | TV Series | Raymond Flagler / Dave Bridley |
| State Trooper | 1956 | TV Series | Colonel Greenlee |
| The Rack | 1956 | Law Officer (as Robert Simon) |
| Studio One in Hollywood | 1955-1956 | TV Series | Rutch / Tom |
| Bigger Than Life | 1956 | Dr. Norton (as Robert Simon) |
| The First Traveling Saleslady | 1956 | Cal - Texas Rancher |
| Kraft Theatre | 1953-1956 | TV Series | Lt. Case |
| The Catered Affair | 1956 | Mr. Joe Halloran (as Robert Simon) |
| The 20th Century-Fox Hour | 1956 | TV Series | Ben Slade |
| Justice | 1955-1956 | TV Series | Reik |
| Never Say Goodbye | 1956 | Dr. Kenneth Evans |
| Jane Wyman Presents The Fireside Theatre | 1956 | TV Series | Lawyer Coleman |
| Studio 57 | 1955-1956 | TV Series | General Elijah Carruthers |
| The Benny Goodman Story | 1956 | Papa Dave Goodman |
| The Court-Martial of Billy Mitchell | 1955 | Adm. Gage (as Robert Simon) |
| Alfred Hitchcock Presents | 1955 | TV Series | Sgt. Halloran |
| The Girl in the Red Velvet Swing | 1955 | Stage Manager (as Robert Simon) |
| Science Fiction Theatre | 1955 | TV Series | Prof. Norman Stern / Captain Damon |
| Luke and the Tenderfoot | 1955 | TV Series | Banker |
| Foxfire | 1955 | Ernest Tyson |
| You Are There | 1955 | TV Series | Rev. Byron Sunderland |
| Medic | 1955 | TV Series | Dr. Theodore Berry |
| 5 Against the House | 1955 | Old Guard (uncredited) |
| Topper | 1955 | TV Series | F.K. Marsten |
| Chief Crazy Horse | 1955 | Jeff Mantz |
| Seven Angry Men | 1955 | Col. Lewis Washington (as Robert Simon) |
| The Philco-Goodyear Television Playhouse | 1951-1954 | TV Series | Merril |
| Rogue Cop | 1954 | Ackerman |
| The Black Dakotas | 1954 | U.S. Marshal Whit Collins (as Robert Simon) |
| Roogie's Bump | 1954 | Boxi |
| Inner Sanctum | 1954 | TV Series | Loomis |
| Waterfront | 1954 | TV Series | Inspector Miller |
| Mayor of the Town | 1954 | TV Series | Dave |
| The Gulf Playhouse | 1953 | TV Series |
| Man Against Crime | 1953 | TV Series | Barney |
| Tales of Tomorrow | 1953 | TV Series | Dr. Giles |
| Lux Video Theatre | 1952 | TV Series | Joey / Jeff / Peterson |
| Woman with a Sword | 1952 | TV Movie | Capt. Scott |
| Out There | 1952 | TV Series |
| Bright Victory | 1951 | Psychiatrist |
| Pulitzer Prize Playhouse | 1951 | TV Series |
| Where the Sidewalk Ends | 1950 | Insp. Nicholas Foley (uncredited) |
| Airwolf | 1985 | TV Series | The Admiral |
| Quincy M.E. | 1977-1982 | TV Series | State Sen. Howard Morganthal / Dr. Fry / Colonel Wilcox / ... |
| Eight Is Enough | 1980 | TV Series | Paul Wells |
| The Amazing Spider-Man | 1978-1979 | TV Series | J. Jonah Jameson |
| The Girl in the Empty Grave | 1977 | TV Movie | Jedediah Partridge |
| The Feather and Father Gang | 1977 | TV Series | Lassiter |
| Tail Gunner Joe | 1977 | TV Movie | Drew Pearson |
| Good Heavens | 1976 | TV Series | Peterson |
| McMillan & Wife | 1976 | TV Series | Military Judge |
| The Streets of San Francisco | 1972-1976 | TV Series | Captain Rudy Olsen / Capt. Rudy Olsen / Captain O'Hare / ... |
| McCloud | 1973-1976 | TV Series | Caine / Tobey Harris |
| Cannon | 1975 | TV Series | Senator Murdock |
| Ellery Queen | 1975 | TV Series | Eben Wright |
| Columbo | 1975 | TV Series | Dr. Westrum |
| Hawaii Five-O | 1975 | TV Series | Hugh Tilles |
| Amy Prentiss | 1974 | TV Series | Sam Farber |
| Police Woman | 1974 | TV Series | Dr. Foreman |
| The Six Million Dollar Man | 1974 | TV Series | The Sheriff |
| Winter Kill | 1974 | TV Movie | Harvey |
| Barnaby Jones | 1974 | TV Series | Mr. Strand |
| M*A*S*H | 1973 | TV Series | Gen. Maynard M. Mitchell |
| The Six Million Dollar Man: Wine, Women and War | 1973 | TV Movie | Capt. Walker |
| The New Temperatures Rising Show | 1973 | TV Series | Lowell |
| The Partridge Family | 1973 | TV Series | Mr. Gordon |
| Assignment: Vienna | 1972 | TV Series | Prince Hohlenberg |
| Mod Squad | 1969-1972 | TV Series | Fred Styles / Dean McIntyre |
| Marcus Welby, M.D. | 1970-1972 | TV Series | Dr. Graham / Dr.Byron V. Anders |
| Nichols | 1971 | TV Series | Slade |
| Private Duty Nurses | 1971 | Dr. Sutton |
| Bewitched | 1964-1971 | TV Series | Frank Stephens |
| The Interns | 1971 | TV Series | Julian Beach |
| Nancy | 1970-1971 | TV Series | Uncle Everett McPherson |
| Love, American Style | 1970 | TV Series | Paul Grayson (segment "Love and the Young Executive") |
| Wild Women | 1970 | TV Movie | Col. Donahue |
| Bonanza | 1960-1970 | TV Series | George Thurston / Len Keith |
| The Guns of Will Sonnett | 1969 | TV Series | Sheriff Devon |
| The Outcasts | 1969 | TV Series | Sheriff Lockhart |
| The Virginian | 1963-1968 | TV Series | Sam Burmeister / Rafe Potter / Eric Larsen / ... |
| It Takes a Thief | 1968 | TV Series | Vogel |
| The Legend of Custer | 1968 | General Alfred Terry |
| Run for Your Life | 1968 | TV Series | The Judge |
| The Andy Griffith Show | 1968 | TV Series | Mr. Crawford |
| The Reluctant Astronaut | 1967 | Cervantes (as Robert Simon) |
| Laredo | 1965-1967 | TV Series | Mr. Tinker / Sen. John Sparks |
| The Rat Patrol | 1967 | TV Series | Col. Beckman |
| Custer | 1967 | TV Series | Gen. Alfred Terry / Brig. Gen. Alfred Terry |
| The Iron Men | 1966 | TV Movie | T J Whitcomb |
| The Third Killer | 1966 | Short | Rellik |
| The Road West | 1966 | TV Series | Pratt |
| Gunsmoke | 1957-1966 | TV Series | Col. Amos Jessup / Will Lukens / Jonah / ... |
| The Lucy Show | 1966 | TV Series | Dr. Robert F. Simon |
| Get Smart | 1966 | TV Series | Stueben |
| Blindfold | 1965 | Police Lieutenant (as Robert Simon) |
| Dr. Kildare | 1965 | TV Series | Dr. Stan Brantell |
| The Legend of Jesse James | 1965 | TV Series | Billy Clarke |
| Voyage to the Bottom of the Sea | 1965 | TV Series | President |
| Slattery's People | 1965 | TV Series | Representative Arthur MacAllister |
| Kraft Suspense Theatre | 1965 | TV Series | Gen. 'Red' Brockman |
| Across the River | 1965 | Policeman |
| McHale's Navy | 1964-1965 | TV Series | John Burton / Capt. Shepard |
| Profiles in Courage | 1965 | TV Series | Andrew Judson / Clay |
| Fate Is the Hunter | 1964 | Proctor |
| Daniel Boone | 1964 | TV Series | Blackfish |
| The Great Adventure | 1964 | TV Series | Grief |
| Ben Casey | 1962-1964 | TV Series | Dr. Max White |
| Arrest and Trial | 1963-1964 | TV Series | Judge Shaw / Judge James Shaw |
| The Outer Limits | 1963 | TV Series | Gen. Maximillian R. Hart |
| Captain Newman, M.D. | 1963 | Lt. Col. M.B. Larrabee |
| Mr. Novak | 1963 | TV Series | Kailey |
| 77 Sunset Strip | 1963 | TV Series | Frank Harrison |
| The Greatest Show on Earth | 1963 | TV Series | Greenwalt |
| The Fugitive | 1963 | TV Series | Murphy |
| A New Kind of Love | 1963 | Bertram Chalmers, Sherman's Boss |
| Wall of Noise | 1963 | Dave McRaab |
| The Dakotas | 1963 | TV Series | Charles Kimberly |
| The Twilight Zone | 1963 | TV Series | Harvey |
| Perry Mason | 1958-1963 | TV Series | Philip Hillman / Anthony Beldon / Edward Bannister |
| Saints and Sinners | 1962-1963 | TV Series | Dave Tabak |
| The Lloyd Bridges Show | 1962 | TV Series | Chief Petty Officer |
| Sam Benedict | 1962 | TV Series | Bill Gottlieb |
| The Dick Powell Theatre | 1961-1962 | TV Series | Dave Tabak / Ben Hagen / Colonel |
| Wagon Train | 1958-1962 | TV Series | Samuel Schofield / Jay Thorton |
| Kraft Mystery Theater | 1962 | TV Series | Sid March |
| The Spiral Road | 1962 | Dr. Martens |
| Target: The Corruptors | 1961-1962 | TV Series | Wilson |
| The Defenders | 1962 | TV Series | Dr. Ernest Montgomery |
| Rawhide | 1960-1962 | TV Series | Mackie / Asa Junkin |
| The Man Who Shot Liberty Valance | 1962 | Handy Strong |
| Cain's Hundred | 1962 | TV Series | Leonard Yates |
| The Gertrude Berg Show | 1962 | TV Series | Mr. Harris |
| Outlaws | 1962 | TV Series | Sholem Fischer |
| Frontier Circus | 1962 | TV Series | Jess Bailey |
| Bus Stop | 1962 | TV Series | Paul Kent |
| Have Gun - Will Travel | 1957-1962 | TV Series | Samuel Keel / Morgan Gibbs / Frank Wellman / ... |
| Straightaway | 1962 | TV Series |
| Ichabod and Me | 1962 | TV Series |
| Ripcord | 1962 | TV Series | Speed Domaine |
| Hawaiian Eye | 1961 | TV Series | Ronald Davidson |
| Route 66 | 1960-1961 | TV Series | Jed Wharton / Mr. Pepperell |
| Sea Hunt | 1961 | TV Series | Dr.Tomaso Ricou / Professor Aaron Halliday |
| Holiday Lodge | 1961 | TV Series | Conrad Holiday |
| The Case of the Dangerous Robin | 1961 | TV Series |
| The Asphalt Jungle | 1961 | TV Series | Mr. Heldon |
| Lawman | 1959-1961 | TV Series | Pa Beason / Mr. Harmon |
| The Roaring 20's | 1961 | TV Series | King Ritter |
| Klondike | 1961 | TV Series | Ed Nash |
| The Untouchables | 1960-1961 | TV Series | Cummings / Police Chief Towers |
| Bat Masterson | 1960 | TV Series | Harrison Whitney |
| Tess of the Storm Country | 1960 | Mr. Graves |
| The DuPont Show with June Allyson | 1960 | TV Series | Dr. Philip Harvell |
| The Wizard of Baghdad | 1960 | Shamadin |
| The Facts of Life | 1960 | Motel Clerk |
| Dante | 1960 | TV Series | Frank Diniakos |
| Stagecoach West | 1960 | TV Series | Tom Osgood, Sr. |
| Pay or Die | 1960 | Police Commissioner |
| Shotgun Slade | 1960 | TV Series | Bob Batson |
| Tate | 1960 | TV Series | The Sheriff |
| Tombstone Territory | 1960 | TV Series | Governor Armstrong |
| The Texan | 1959-1960 | TV Series | Vance / Sheriff Will Crandall |
| The Man from Blackhawk | 1960 | TV Series | Sheriff Jim Claudious |
| Wichita Town | 1960 | TV Series | Walt McCloud |
| Lock Up | 1960 | TV Series | Martin Reeves |
| Johnny Midnight | 1960 | TV Series | Hendrik Hyer / Simon |
| Johnny Ringo | 1959 | TV Series | Sam Stoner |
| Operation Petticoat | 1959 | Capt. J.B. Henderson |
| Law of the Plainsman | 1959 | TV Series | Frank Keller |
| Cheyenne | 1957-1959 | TV Series | Hub Lassiter / Chad Wilcox |
| The Last Angry Man | 1959 | Lyman Gattling |
| Goodyear Theatre | 1959 | TV Series |
| Black Saddle | 1959 | TV Series | Judge Mercer McKinney |
| Adventures in Paradise | 1959 | TV Series | Ned Hogue |
| Laramie | 1959 | TV Series | Bert Bigelow |
| Face of Fire | 1959 | The Judge (as Robert Simon) |
| Peter Gunn | 1959 | TV Series | Capt. Ben Loomis |
| Westinghouse Desilu Playhouse | 1959 | TV Series | General Finch |
| Compulsion | 1959 | Police Lt. Johnson (as Robert Simon) |
| Border Patrol | 1959 | TV Series | Fenton |
| Zane Grey Theater | 1959 | TV Series | Sheriff John Hanley |