| Movie | 1968 | A Way Out of the Wilderness | Narrator | |
| Movie | 1972 | Death Follows a Psycho | | |
| Movie | 1974 | Earthquake | Sam Royce | |
| Movie | 1958 | The Buccaneer | Mercier | |
| Movie | 1979 | Mission Galactica: The Cylon Attack | Cmdr. Adama | |
| Movie | 1970 | A Place in History | Narrator | |
| Movie | 1956 | Autumn Leaves | Mr. Hanson | |
| Movie | 1957 | Peyton Place | District Attorney | |
| Movie | 1968 | The Dean Martin Christmas Show | Self (uncredited) | |
| Movie | 1954 | The Silver Chalice | Peter | |
| Movie | 1980 | Conquest of the Earth | Cmdr. Adama | |
| Movie | 1977 | Yabba Dabba Doo! The Happy World of Hanna-Barbera | Self | |
| Movie | 1959 | The Trap | Davis | |
| Movie | 1982 | Heidi's Song | Grandfather (voice) | |
| Movie | 1955 | Tight Spot | Benjamin Costain | |
| Movie | 1951 | Eye Witness No. 33 | Self - Narrator (voice) | |
| Movie | 1944 | Global Air Routes | Narrator (voice) | |
| Movie | 1944 | Look to the North | Narrator (voice) | |
| Movie | 1944 | Our Northern Neighbour | Narrator (voice) | |
| Movie | 1953 | Social-Sex Attitudes in Adolescence | narrator | |
| Movie | 1949 | White Fortress | Self - Narrator | |
| Movie | 1958 | The Last of the Fast Guns | Michael O'Reilly | |
| Movie | 1978 | Battlestar Galactica | Cmdr. Adama | |
| Movie | 1958 | The Gift of Love | Grant Allan | |
| Movie | 1957 | The Hard Man | Rice Martin | |
| Movie | 1984 | The Nutcracker: A Fantasy on Ice | Self - Narrator | |
| Movie | 1978 | The Case of the Baltimore Girls | Wade Griffin | |
| Movie | 1941 | Warclouds in the Pacific | Narrator (voice) | |
| Movie | 1970 | The Gifts | Narrator | |
| Movie | 1977 | The Trial of Lee Harvey Oswald | Matthew Arnold Watson | |
| Movie | 1980 | Klondike Fever | Inspector Sam Steele | |
| Movie | 1977 | SST: Death Flight | Marshall Cole | |
| Movie | 1969 | Destiny of a Spy | Peter Vanin | |
| Movie | 1971 | The Harness | Peter Randall | |
| Movie | 1950 | The Cliff Hangers | Self - Narration (voice) | |
| Movie | 1975 | Man on the Outside | Wade Griffin | |
| Movie | 1978 | The Bastard | Bishop Francis | |
| Movie | 1962 | The New March of Dimes Presents: The Scene Stealers | Self | |
| Movie | 1975 | Wings in the Wilderness | Self | |
| Movie | 1972 | The Special London Bridge Special | Fiddler on the Roof | |
| Movie | 1966 | Christmas with Lorne Greene | | |
| Movie | 1947 | Johnny at the Fair | | |
| Movie | 1940 | Wings of Youth | Narrator (voice) | |
| Movie | 1959 | The Hangman | Clem J. Cummings | |
| Movie | 1970 | A Man for Loving | James Beal | |
| Movie | 1986 | Vasectomy: A Delicate Matter | Theo | |
| Movie | 1953 | Farewell Oak Street | Narrator | |
| Movie | 1943 | Fighting Norway | Narrator (voice) | |
| Movie | 1968 | Rowan & Martin at the Movies | Self | |
| Movie | 1980 | A Time for Miracles | Bishop John Carroll | |
| Movie | 1950 | Date of Birth | Narration (voice) | |
| Movie | 1940 | Front of Steel | Narrator | |
| Movie | 1986 | Noah's Ark | Noah (voice) | |
| Movie | 1940 | Home Front | Narrator | |
| Movie | 1941 | Churchill's Island | Narrator (voice) | |
| Movie | 1941 | Battle of Brains | Narrator (voice) | |
| Movie | 1940 | Children from Overseas | Narrator | |
| Movie | 1940 | Atlantic Patrol | Narrator | |
| Movie | 1953 | Age of Turmoil | Narrator | |
| Movie | 1941 | Heroes of the Atlantic | Narrator (voice) | |
| Movie | 1986 | The Canadian Conspiracy | | |
| Movie | 1978 | The Little Brown Burro | Storyteller (voice) | |
| Movie | 1945 | Ordeal by Ice | Narrator (voice) | |
| Movie | 1966 | Bonanza: Ride the Wind | Ben Cartwright | |
| Movie | 1942 | The Mask of Nippon | Narrator (voice) | |
| Movie | 1974 | Rex Harrison Presents Stories of Love | Hercule | |
| Movie | 1957 | The Edge of Innocence | Lowell Williams | |
| Movie | 1944 | Break-through | Himself - Narrator | |
| Movie | 1944 | Fighting Sea-Fleas | Narrator (voice) | |
| Movie | 1944 | Trans-Canada Express | Narrator (voice) | |
| Movie | 1944 | Train Busters | Narrator (voice) | |
| Movie | 1945 | Now—The Peace | Narrator (uncredited) | |
| Movie | 1975 | High Country Calling | | |
| Movie | 1972 | The Legend of Amaluk: An Arctic Journey | Narrator | |
| Movie | 1945 | Gateway to Asia | Narrator (voice) | |
| Movie | 1945 | Suffer Little Children | Himself - Narrator | |
| Movie | 1945 | Headline Hunters | Narrator (voice) | |
| Movie | 1957 | Mayerling | Emperor's Aide | |
| Movie | 1945 | The War Is Over | Narrator | |
| Movie | 1953 | Meaning of Adolescence | Narrator | |
| Movie | 1948 | What's on Your Mind | Narrator | |
| Movie | 1953 | 1984 | O'Brien | |
| Movie | 1987 | The Alamo: Thirteen Days to Glory | Gen. Sam Houston | |
| Movie | 1975 | Nevada Smith | Jonas Cord | |
| Movie | 1949 | A Capital Plan | Narrator | |
| Movie | 1947 | Tomorrow's Citizens | Narrator | |
| Movie | 1979 | A Walking Tour of Sesame Street | Ben Cartwright (archive footage) (uncredited) | |
| Movie | N/A | Aldo Leopold 1: His Life and Thought | | |
| Movie | N/A | Aldo Leopold 2: A Sand County Almanac | | |
| Movie | 1942 | The Battle for Oil | Narrator | |
| Movie | 1944 | Pincers on Japan | Narrator | |
| Movie | 1944 | Wounded in Action | Narrator (voice) | |
| Movie | 1974 | Sandy in Disneyland | Self | |
| Movie | 1975 | Tidal Wave | Ambassador Warren Richards | |
| Movie | 1942 | Inside Fighting China | Narrator | |
| Movie | 1973 | Grierson | Self | |
| Movie | 1977 | The Hardy Boys and Nancy Drew Meet Dracula (Parts 1 & 2) | Inspector Hans Stavlin | |
| TV Show | 1978 | Battlestar Galactica | Commander Adama | 21 |
| TV Show | 1955 | Cheyenne | | 1 |
| TV Show | 1959 | Bonanza | Ben Cartwright | 431 |
| TV Show | 1977 | The Love Boat | Buck Hamilton | 3 |
| TV Show | 1984 | Highway to Heaven | Fred Fusco | 1 |
| TV Show | 1982 | Lorne Greene's New Wilderness | Narrator | 104 |
| TV Show | 1962 | The Merv Griffin Show | Self | 2 |
| TV Show | 1952 | Omnibus | | 1 |
| TV Show | 1976 | Donny & Marie | Self | 2 |
| TV Show | 1977 | The Hardy Boys / Nancy Drew Mysteries | | 2 |
| TV Show | 1948 | Studio One | Minister of Truth O'Brien | 1 |
| TV Show | 1980 | Galactica 1980 | Commander Adama | 10 |
| TV Show | 1948 | Macy's Thanksgiving Day Parade | | 0 |
| TV Show | 1955 | Alfred Hitchcock Presents | Mr. X | 1 |
| TV Show | 1978 | Vega$ | | 2 |
| TV Show | 1968 | Rowan & Martin's Laugh-In | Self | 3 |
| TV Show | 1969 | The Johnny Cash Show | Self | 1 |
| TV Show | 1954 | Climax! | Dr. Charles Saunders | 1 |
| TV Show | 1958 | Bronco | | 1 |
| TV Show | 1965 | The Dean Martin Show | | 1 |
| TV Show | 1977 | Roots | | 0 |
| TV Show | 1981 | Aloha Paradise | | 1 |
| TV Show | 1981 | Code Red | Battalion Chief Joe Rorchek | 21 |
| TV Show | 1973 | Griff | | 13 |
| TV Show | 1959 | The Third Man | | 1 |
| TV Show | 1972 | To the Wild Country | Host | 1 |
| TV Show | 1973 | The Dean Martin Celebrity Roasts | Self | 1 |
| TV Show | 1971 | Appointment With Destiny | Narrator | 3 |
| TV Show | 1980 | Siegfried and Roy - Superstars Of Magic | | 1 |
| TV Show | 1982 | Police Squad! | Stabbed Man | 1 |
| TV Show | 1983 | Reading Rainbow | Himself - Narrator (voice) | 1 |
| TV Show | 1976 | Arthur Hailey's The Moneychangers | George Quartermain | 4 |
| TV Show | 1955 | Folio | Beethoven | 1 |
| TV Show | 1955 | Folio | Patiomkin | 2 |
| TV Show | 1980 | The Alan Thicke Show | | 1 |
| TV Show | 1971 | V.I.P. Schaukel | Self | 1 |
| TV Show | 1948 | Studio One | Minister of the Interior | 1 |
| TV Show | 1948 | Studio One | Alexander Ferrando | 1 |
| TV Show | 1948 | Studio One | Frank Leslie | 1 |
| TV Show | 1948 | Studio One | Dr. Madison West | 1 |
| TV Show | 1948 | Bambi-Verleihung | Self | 1 |
| TV Show | 1962 | The Tonight Show Starring Johnny Carson | Self - Guest Host | 1 |
| TV Show | 1977 | Roots | John Reynolds | 2 |
| TV Show | 1971 | The Pet Set | Self | 1 |
| TV Show | 1962 | The Tonight Show Starring Johnny Carson | Self | 3 |
| TV Show | 1955 | Cheyenne | Colonel Bell | 1 |
| TV Show | 1964 | Die Drehscheibe | Self | 1 |
| TV Show | 1957 | Suspicion | Monty | 1 |
| TV Show | N/A | The Glen Campbell Goodtime Hour: Christmas Special (December 20, 1970) | self | 1 |
| TV Show | 1958 | Kraft Music Hall | Self - Host | 1 |
| TV Show | 1944 | Golden Globe Awards | Self - Presenter | 2 |
| TV Show | 1969 | The Glen Campbell Goodtime Hour | Self | 1 |
| TV Show | 1958 | Shirley Temple's Storybook | King Bertrand | 1 |
| TV Show | 1957 | Sailor of Fortune | Capt. Grant 'Mitch' Mitchell | 26 |
| TV Show | 1974 | Dinah! | Self | 1 |
| TV Show | N/A | The Hardy Boys and Nancy Drew Meet Dracula | Inspector Hans Stavlin | 1 |
