| Year | Title | Role | Notes |
| 1955 | Blackboard Jungle | Artie West | |
| It's a Dog's Life | Wildfire the dog | Voice, Uncredited |
| 1956 | Tribute to a Bad Man | Lars Peterson | |
| The Millionaire | Joey Diamond | Episode: "The Joey Diamond Story" |
| Climax! | Ted | Episode: "Strange Hostage" |
| 1957 | Men in War | Corporal James Zwickley | |
| Alfred Hitchcock Presents | Benny Mungo | Season 2 Episode 38: "A Little Sleep" |
| 1958 | Richard Diamond, Private Detective | Joe Rovi | Episode: "The Ed Church Case" |
| Hell's Five Hours | Burt Nash | |
| King Creole | Shark | |
| God's Little Acre | Shaw Walden | |
| 1958–1959 | The Rifleman | Johnny Cotton | ABC-TV, 2 episodes |
| 1959 | Naked City | David Greco | ABC-TV, Episode: "The Shield" |
| Johnny Ringo | Bill Stoner | CBS-TV, Episode: "Kid With a Gun" |
| The Lawless Years | Nick Joseph | NBC-TV, Episode: "The Nick Joseph Story (pilot)" |
| 1960 | The Brothers Brannagan | Locke | Syndicated TV, series premiere, Episode: "Tune in for Murder" |
| The Barbara Stanwyck Show | Leroy Benson | NBC-TV, Episode: "The Key to the Killer" |
| Cimarron | Wes Jennings | |
| 1960–1961 | Bonanza | Lassiter / Ab Brock | 2 episodes |
| 1960–1962 | The Untouchables | Vince Shirer / Collier | 2 episodes |
| 1961 | Posse from Hell | Crip | |
| The Law and Mr. Jones | Dr. Bigelow | ABC-TV, Episode: "A Very Special Citizen" |
| Portrait of a Mobster | Dutch Schultz | |
| The Tall Man | Skip Farrell | NBC-TV, Episode: "Time of Foreshadowing" |
| 1962 | The New Breed | Belman | ABC-TV, Episode: "To Sell Another Human Being" |
| 1962–1967 | Combat! | Sergeant Chip Saunders | ABC-TV, 152 episodes |
| 1969 | Target: Harry | Harry Black | Alternative titles: What's In it For Harry?, How to Make It |
| 1970 | A Man Called Sledge | Gold Guard Scout | Uncredited |
| The Immortal | Sheriff Dan W. Wheeler | Episode: "The Rainbow Butcher" |
| Dan August | Steve Harrison | ABC-TV, Episode: "The Union Forever" |
| 1971 | Hawaii Five-O | Edward Heron | CBS-TV, Episode: "Two Doves and Mr. Heron" |
| Mannix | Eric Latimer | CBS-TV, Episode: "Days Beyond Recall" |
| The F.B.I. | Porter Bent | Episode: "The Stalking Horse" |
| Sarge | Lieutenant Ross Edmonds | TV, Episode: "A Push Over the Edge" |
| 1972 | McCloud | Richard | NBC-TV, Episode: "A Little Plot at Tranquil Valley" |
| Owen Marshall: Counselor at Law | Andy Capaso | ABC-TV, Episode: "Eight Cents Worth of Protection" |
| The Glass House | Hugo Slocum | TV movie |
| Mission: Impossible | Joseph Collins | CBS-TV, Episode: "Two Thousand" |
| 1973 | Love Story | Dave Walters | NBC-TV, Episode: "The Cardboard House" |
| The F.B.I. | John Omar Stahl | Episode: "Desperate Journey" |
| The Streets of San Francisco | Vic Tolliman | ABC-TV, Episode: "The Twenty-Four Karat Plague" |
| 1973–1974 | Police Story | Sergeant Joe LaFrieda | NBC-TV, 3 episodes |
| The Evil Touch | Purvis Greene | TV, 2 episodes |
| 1974 | Dirty Mary, Crazy Larry | Captain Franklin | |
| The Take | Manso | |
| The California Kid | Roy Childress | TV movie |
| Funeral for an Assassin | Michael Cardiff | |
| 1975 | Wanted: Babysitter | Vic, the kidnapper | |
| The Night That Panicked America | Hank Muldoon | TV movie |
