| Battlestar Galactica | 1978 | Assault 9 | TV Show |
| Fantasy Island | 1977 | Butler | TV Show |
| Fish | 1977 | Harry | TV Show |
| Captains and the Kings | 1976 | Boland | TV Show |
| How the West Was Won | 1976 | Ben Dodge | TV Show |
| Once an Eagle | 1976 | Militia Colonel | TV Show |
| The New Daughters of Joshua Cabe | 1976 | Codge Collier | TV Movie |
| Kate McShane | 1975 | Pat McShane | TV Show |
| S.W.A.T. | 1975 | James Patrick Ryan | TV Show |
| The Blue Knight | 1975 | Monahan | TV Show |
| Little House on the Prairie | 1974 | Sandy Nelson | TV Show |
| The Day of the Wolves | 1973 | The Sheriff | Movie |
| Columbo | 1971 | Captain | TV Show |
| Bandolero! | 1968 | Robbie O'Hare | Movie |
| Lancer | 1968 | Coley McHugh | TV Show |
| The Outcasts | 1968 | Welch | TV Show |
| The Gnome-Mobile | 1967 | Horatio Quaxton | Movie |
| The Happiest Millionaire | 1967 | Police Sgt. | Movie |
| The King's Pirate | 1967 | Sparkes | Movie |
| Mannix | 1967 | Scott Winters | TV Show |
| The Guns of Will Sonnett | 1967 | Pat Murphy | TV Show |
| The High Chaparral | 1967 | Sandy McIntire | TV Show |
| Follow Me, Boys! | 1966 | Edward White, Sr. | Movie |
| Daktari | 1966 | Giles | TV Show |
| Family Affair | 1966 | Mr. Michaels | TV Show |
| Tarzan | 1966 | Red McGeehan | TV Show |
| Iron Horse | 1966 | Beau Sidell | TV Show |
| The Monroes | 1966 | Miner | TV Show |
| Convoy | 1965 | Major Perth-Whittaker | TV Show |
| Honey West | 1965 | Insurance Investigator Booth | TV Show |
| Lost in Space | 1965 | Hamish | TV Show |
| Mara of the Wilderness | 1965 | Dr. Frank Wade (uncredited) | Movie |
| Cheyenne Autumn | 1964 | Dr. O'Carberry | Movie |
| Mary Poppins | 1964 | Hound, Reporter #4 (voice, uncredited) | Movie |
| Daniel Boone | 1964 | Bartender, Ephron Marsh, Liam O'Hara | TV Show |
| Bob Hope Presents the Chrysler Theatre | 1963 | Cunningham | TV Show |
| General Hospital | 1963 | Judge | TV Show |
| My Favorite Martian | 1963 | Seamus O'Hara | TV Show |
| The Dakotas | 1963 | Fallain | TV Show |
| The Great Adventure | 1963 | Major Carlton | TV Show |
| The Littlest Hobo | 1963 | Meacham | TV Show |
| The Outer Limits | 1963 | Karl Emmet | TV Show |
| The Story of Dr. Lister | 1963 | McTavish (uncredited) | Short Film |
| The Beverly Hillbillies | 1962 | Police Officer Tim O'Sullivan | TV Show |
| The Virginian | 1962 | Cobb, Harry Post, Walter May | TV Show |
| G.E. True | 1962 | Jamie McDonald | TV Show |
| Valley of the Dragons | 1961 | Michael Denning | Movie |
| The Dick Powell Theatre | 1961 | Sgt. Lansing | TV Show |
| Checkmate | 1960 | Stamper | TV Show |
| Insight | 1960 | Father Conroy | TV Show |
| My Three Sons | 1960 | Tom Grogan | TV Show |
| Stagecoach West | 1960 | Finn McCool | TV Show |
| Surfside 6 | 1960 | Kevin Flanagan | TV Show |
| Thriller | 1960 | Patrick Galt, Sean O'Danagh | TV Show |
| Overland Trail | 1960 | The O'Mara | TV Show |
| The Islanders | 1960 | Quinn | TV Show |
| Adventures in Paradise | 1959 | Mike Milligan, Shay | TV Show |
| One Step Beyond | 1959 | Michael Barry | TV Show |
| Bonanza | 1959 | Mark Connors, Professor James Aloysius McCarthy | TV Show |
| Laramie | 1959 | Gordon | TV Show |
| Rawhide | 1959 | Finn | TV Show |
| The Detectives | 1959 | Swami | TV Show |
| The DuPont Show with June Allyson | 1959 | Father Ray | TV Show |
| The Untouchables | 1959 | Police Capt. John Stanwood, Vince O'Gara | TV Show |
| The Man from Blackhawk | 1959 | Billy Gordon | TV Show |
| Wildcatters | 1959 | Driller | TV Show |
| Bronco | 1958 | Terrence Harrigan | TV Show |
| Shirley Temple's Storybook | 1958 | Lawless | TV Show |
| Steve Canyon | 1958 | Bert Quillan | TV Show |
| The Rifleman | 1958 | Col. Charles Black, Dennis O'Flarrety | TV Show |
| Wanted: Dead or Alive | 1958 | 'Doc' Phillips | TV Show |
| Westinghouse Desilu Playhouse | 1958 | Jack Gorman | TV Show |
| Colgate Theatre | 1958 | Aristotle | TV Show |
| The Guns of Fort Petticoat | 1957 | Emmett Kettle | Movie |
| Have Gun - Will Travel | 1957 | Cpl. Mike Callahan | TV Show |
| Perry Mason | 1957 | Fred Wenzel, Hannibal Harvey, Harry Fothergill | TV Show |
| Richard Diamond, Private Detective | 1957 | Ted O'Malley | TV Show |
| Tales of Wells Fargo | 1957 | Con Toole | TV Show |
| The Frank Sinatra Show | 1957 | Otis Chance | TV Show |
| The Restless Gun | 1957 | Mike O'Hara | TV Show |
| Wagon Train | 1957 | Casey | TV Show |
| The Californians | 1957 | Jack McGivern | TV Show |
| Diane | 1956 | Count Michel Montgomery | Movie |
| Broken Arrow | 1956 | Michael Shawn | TV Show |
| Telephone Time | 1956 | Officer McTeague | TV Show |
| The Adventures of Jim Bowie | 1956 | Pat Donovan, Walter Holleran | TV Show |
| Zane Grey Theater | 1956 | Graham Clague | TV Show |
| Tales of the 77th Bengal Lancers | 1956 | Captain Clary | TV Show |
| Moonfleet | 1955 | Elzevir Block | Movie |
| The King's Thief | 1955 | Sheldon | Movie |
| The Long Gray Line | 1955 | Dinny Maher | Movie |
| Alfred Hitchcock Presents | 1955 | Brother Gerard, Irish Bar Patron | TV Show |
| Gunsmoke | 1955 | Clete Bolden, Sham | TV Show |
| Matinee Theatre | 1955 | Hindley | TV Show |
| The 20th Century-Fox Hour | 1955 | Shawn | TV Show |
| The Life and Legend of Wyatt Earp | 1955 | Edgar 'Muley' Boles | TV Show |
| I Cover the Underworld | 1955 | Gunner O'Hara & John O'Hara | Movie |
| Frontier | 1955 | Gavin | TV Show |
| Celebrity Playhouse | 1955 | Detective Hank Jarrett | TV Show |
| Charade | 1954 | Jack Stuydevant | Movie |
| Ring of Fear | 1954 | Dublin O'Malley | Movie |
| Them! | 1954 | Maj. Kibbee | Movie |
| Climax! | 1954 | Mark Yorke | TV Show |
| Lassie | 1954 | Captain Kennedy | TV Show |
| Medic | 1954 | TV Show |
| The Magical World of Disney | 1954 | Capt. Myles, Officer Madden, Sean O'Casey | TV Show |
| Child, The | 1954 | Rev. Smith | Short Film |
| Botany Bay | 1953 | Marine Sergeant (uncredited) | Movie |
| Island in the Sky | 1953 | Frank Lovatt | Movie |
| Man in the Attic | 1953 | Constable #1 | Movie |
| Niagara | 1953 | Sam (uncredited) | Movie |
| Plunder of the Sun | 1953 | Jefferson | Movie |
| G.E. True Theater | 1953 | TV Show |
| Rogue's March | 1953 | McGinty | Movie |
| Face to Face | 1952 | Second Mate Robinson ('The Secret Sharer') | Movie |
| Les Miserables | 1952 | Bamtasbois (uncredited) | Movie |
| The Quiet Man | 1952 | Owen Glynn (as Sean McGlory) | Movie |
| What Price Glory | 1952 | Lt. Austin (uncredited) | Movie |
| Cavalcade of America | 1952 | Andrew Johnson | TV Show |
| Death Valley Days | 1952 | Charley Gentry, Joaquin Miller | TV Show |
| Four Star Playhouse | 1952 | Robert Upton | TV Show |
| The Unexpected | 1952 | TV Show |
| Your Jeweler's Showcase | 1952 | TV Show |
| Anne of the Indies | 1951 | Hackett | Movie |
| David and Bathsheba | 1951 | Aide to King David (First Scene) (uncredited) | Movie |
| Lorna Doone | 1951 | Charleworth Doone | Movie |
| Storm Warning | 1951 | Shore | Movie |
| The Desert Fox: The Story of Rommel | 1951 | Jock (uncredited) | Movie |
| The Daughter of Rosie O'Grady | 1950 | Jim Moore | Movie |
| The Glass Menagerie | 1950 | Richard (uncredited) | Movie |
| Lux Video Theatre | 1950 | Albert | TV Show |
| Hollywood Theatre Time | 1950 | TV Show |
| Roughshod | 1949 | Fowler (as Shawn McGlory) | Movie |
| Fireside Theatre | 1949 | TV Show |
| Beyond Glory | 1948 | Barney | Movie |
| Dick Tracy Meets Gruesome | 1947 | Officer Carney (uncredited) | Movie |
| Dick Tracy's Dilemma | 1947 | Officer Dillon (uncredited) | Movie |