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| Title | Year | Status | Character |
|---|
| For Men Only | 1952 | Dean Oliver Harland Mayberry |
| Indian Uprising | 1952 | Cliff Taggert |
| Callaway Went Thataway | 1951 | Drunk |
| China Corsair | 1951 | Capt. Frenchy |
| The Texas Rangers | 1951 | Dave Rudabaugh |
| I Was an American Spy | 1951 | Sgt. John Phillips |
| The Lion Hunters | 1951 | Marty Martin |
| Oh! Susanna | 1951 | Trooper Emers |
| The Du Pont Story | 1950 | Coleman du Pont |
| Revenue Agent | 1950 | Steve Daniels aka Steve Adams |
| Chain Gang | 1950 | Cliff Roberts |
| Convicted | 1950 | Det. Bailey |
| The Cariboo Trail | 1950 | Murphy |
| The Next Voice You Hear... | 1950 | Mitch (uncredited) |
| Ma and Pa Kettle Go to Town | 1950 | George Donahue (uncredited) |
| Barricade | 1950 | Clay's Man (uncredited) |
| Montana | 1950 | Rodney Ackroyd |
| Backfire | 1950 | Unseen Voice from Radio (voice, uncredited) |
| East Side, West Side | 1949 | Alec Dawning |
| Fighting Man of the Plains | 1949 | Ken Vedder |
| Ranger of Cherokee Strip | 1949 | Joe Bearclaws |
| The House Across the Street | 1949 | Opening Narrator (voice, uncredited) |
| Task Force | 1949 | Ship's Radio (voice, uncredited) |
| It's a Great Feeling | 1949 | Opening Off-Screen Narrator (uncredited) |
| South of Rio | 1949 | Henchman Bob Mitchell |
| The Fountainhead | 1949 | Reporter (uncredited) |
| One Last Fling | 1949 | Vic Lardner |
| Look for the Silver Lining | 1949 | Doctor (uncredited) |
| Flamingo Road | 1949 | Voice of Police Radio Broadcaster (uncredited) |
| Homicide | 1949 | Opening Off-Screen Narrator (voice, uncredited) |
| A Kiss in the Dark | 1949 | Voice of Radio Concert Broadcaster (uncredited) |
| South of St. Louis | 1949 | Lee Price |
| Flaxy Martin | 1949 | Hap Richie |
| John Loves Mary | 1949 | Col. McGaw (uncredited) |
| One Sunday Afternoon | 1948 | Jasper (uncredited) |
| Whiplash | 1948 | Costello |
| The Decision of Christopher Blake | 1948 | J. Roger Bascomb (uncredited) |
| Adventures of Don Juan | 1948 | Don Rodrigo |
| Johnny Belinda | 1948 | Mountie (uncredited) |
| Embraceable You | 1948 | Dr. Wirth / Opening Off-Screen Narrator |
| The Big Punch | 1948 | Voice of Football Broadcaster (uncredited) |
| Romance on the High Seas | 1948 | Car Salesman (uncredited) |
| Let's Sing a Stephen Foster Song | 1948 | Short | Morrison Foster (uncredited) |
| To the Victor | 1948 | Steve |
| April Showers | 1948 | Narrator (voice, uncredited) |
| The Voice of the Turtle | 1947 | Naval Officer (unconfirmed) |
| Always Together | 1947 | Doberman |
| That Hagen Girl | 1947 | Herb Delaney |
| The Unsuspected | 1947 | Bill (uncredited) |
| Let's Sing a Song of the West | 1947 | Short | Pianist / Singer of 'Home on the Range' (uncredited) |
| Dark Passage | 1947 | Detective Kennedy |
| Life with Father | 1947 | Morley - Young Clergyman (uncredited) |
| Deep Valley | 1947 | uncredited |
| The Circus Horse | 1947 | Short |
| The Unfaithful | 1947 | Roger |
| Possessed | 1947 | Asst. District Attorney |
| Stallion Road | 1947 | Horse Show Announcer (uncredited) |
| Nora Prentiss | 1947 | NYC Emergency Room doctor |
| March On, America! | 1942 | Short | Paratrooper (uncredited) |
| Passage from Hong Kong | 1941 | Jeff Hunter |
| The Bride Came C.O.D. | 1941 | Second Reporter (as Keith Douglas) |
| The Nurse's Secret | 1941 | Dr. Keene (as Keith Douglas) |
| Affectionately Yours | 1941 | Airline Official (uncredited) |
| Strange Alibi | 1941 | Reporter (uncredited) |
| Wings of Steel | 1941 | Short |
| Here Comes Happiness | 1941 | Announcer (voice, uncredited) |
| The Roundup | 1941 | Trooper |
| The Great Mr. Nobody | 1941 | Mr. McGraw |
| Love Thy Neighbor | 1940 | Doorman at Rehearsal (uncredited) |
| The Mad Doctor | 1940 | Hotel Clerk (uncredited) |
| North West Mounted Police | 1940 | Constable Carter |
| Arise, My Love | 1940 | College Boy (uncredited) |
| Rhythm on the River | 1940 | Party Guest (uncredited) |
| The Ghost Breakers | 1940 | Intern (uncredited) |
| The Way of All Flesh | 1940 | Timothy |
| Those Were the Days! | 1940 | Allen |
| Opened by Mistake | 1940 | State Trooper (uncredited) |
| Women Without Names | 1940 | Secretary (uncredited) |
| 'G' Men | 1935 | Agent - 1949 Reissue Scenes (uncredited) |
| Hawaii Five-O | 1973 | TV Series | Turner Carr / Sinclair / Fleming |
| O'Hara, U.S. Treasury | 1972 | TV Series | Policeman |
| Cade's County | 1971 | TV Series | Capt. Steve Hoover |
| Bracken's World | 1969-1970 | TV Series | Propman / Mr. Harvey |
| The Big Valley | 1965-1969 | TV Series | Sheriff Fred Madden
Sheriff Madden
Marshal
... |
| Dragnet 1967 | 1968 | TV Series | Inspector Mills |
| Bonanza | 1959-1968 | TV Series | Sheriff Sam Purcell / Jonathan Frazier / Big Charlie Monahan / ... |
| The Destructors | 1968 | General |
| The Virginian | 1966-1967 | TV Series | Mr. Oliver / Sheriff |
| The Fastest Guitar Alive | 1967 | Joe |
| Valley of Mystery | 1967 | TV Movie | Charles Kiley |
| Iron Horse | 1967 | TV Series | Adam Preston |
| Gunsmoke | 1960-1966 | TV Series | John Stoner / Talbot / Yancey Cliver / ... |
| Lassie | 1964-1966 | TV Series | Dale Jensen / Father |
| The Legend of Jesse James | 1965 | TV Series | Ben Todd |
| Rawhide | 1959-1965 | TV Series | Nat Benson / Maxey / Ewan Dangerfield |
| Perry Mason | 1957-1965 | TV Series | Brady Duncan / Lucky Sterling / Steven Boles / ... |
| The Outer Limits | 1965 | TV Series | Gen. Daniel Pettit |
| Everglades | 1961-1962 | TV Series | Mike Flint / Dan Martin |
| Flight of the Lost Balloon | 1961 | Sir Hubert Warrington |
| The Deputy | 1960 | TV Series | Sheriff Bates |
| Sugarfoot | 1960 | TV Series | Sheriff Williams |
| The Rifleman | 1960 | TV Series | Pete Crandell |
| Riverboat | 1960 | TV Series | McLeish |
| Lock Up | 1960 | TV Series | Gavin Bledsoe |
| Have Gun - Will Travel | 1960 | TV Series | Wynn Loring |
| The Amazing Transparent Man | 1960 | Joey Faust |
| The Texan | 1959-1960 | TV Series | Sheriff / Jason Quarles |
| Pony Express | 1960 | TV Series | General Tate / Marshal Jeb Loring |
| Alfred Hitchcock Presents | 1956-1959 | TV Series | Union Officer / Austin / Jonathan Dalliford |
| Laramie | 1959 | TV Series | Gunrunner |
| Maverick | 1958-1959 | TV Series | McFearson / Connors |
| The Life and Legend of Wyatt Earp | 1959 | TV Series | Dave Mather |
| The Alligator People | 1959 | Dr. Wayne MacGregor |
| Zorro | 1959 | TV Series | Manuel Larrios |
| Colt .45 | 1959 | TV Series | Jay Brisco |
| Wagon Train | 1958-1959 | TV Series | Col. Hillary / John Loring |
| The Lineup | 1959 | TV Series |
| The Restless Gun | 1959 | TV Series | Sheriff / Cal Winfield |
| General Electric Theater | 1959 | TV Series | Sam Allen |
| One Step Beyond | 1959 | TV Series | Sgt. Cooper |
| Bat Masterson | 1959 | TV Series | Sheriff Jeb Crater |
| Good Day for a Hanging | 1959 | Voice of Gang Member (uncredited) |
| Rescue 8 | 1958 | TV Series | Tom Devlin |
| Jefferson Drum | 1958 | TV Series | Dallas |
| Lone Texan | 1958 | Maj. Phillip Harvey |
| Northwest Passage | 1958 | TV Series | Eli Dillon |
| Cimarron City | 1958 | TV Series | Sam Thaw |
| Wanted: Dead or Alive | 1958 | TV Series | Sheriff Hank Bedloe |
| Bronco | 1958 | TV Series | Paul Duquesne |
| Flight | 1958 | TV Series | Undetermined Role |
| The Rough Riders | 1958 | TV Series | Sgt. True |
| Tombstone Territory | 1958 | TV Series | Sam Colby |
| The Lone Ranger and the Lost City of Gold | 1958 | Ross Brady |
| The Bonnie Parker Story | 1958 | Tom Steel |
| State Trooper | 1958 | TV Series | Harry Goodman |
| Studio 57 | 1958 | TV Series |
| Studio One in Hollywood | 1958 | TV Series | Mr. Gordon |
| Code 3 | 1957 | TV Series | Sgt. Fred Coombs |
| Rockabilly Baby | 1957 | Tom Griffith |
| Navy Log | 1956-1957 | TV Series | Commander Bourne / Lt.. Cmdr. Boggs |
| Chicago Confidential | 1957 | Ken Harrison |
| The Land Unknown | 1957 | Capt. Burnham (as Douglas R. Kennedy) |
| Tales of Wells Fargo | 1957 | TV Series | Martin Yates |
| The Adventures of Jim Bowie | 1957 | TV Series | Colonel Bradford |
| Cheyenne | 1957 | TV Series | Blake Holloway |
| Playhouse 90 | 1957 | TV Series |
| Hell's Crossroads | 1957 | Frank James |
| Last of the Badmen | 1957 | Hawkins |
| The Last Wagon | 1956 | Col. Normand |
| Strange Intruder | 1956 | Parry Sandborn |
| Miami Exposé | 1956 | Dan McCracken |
| Sneak Preview | 1956 | TV Series |
| Steve Donovan, Western Marshal | 1955-1956 | TV Series | Marshal Steve Donovan |
| Dragnet | 1955-1956 | TV Series | Agent Tom Ashford |
| Matinee Theatre | 1955-1956 | TV Series |
| Assignment: Mexico | 1956 | TV Movie | Donovan |
| TV Reader's Digest | 1955 | TV Series | Dr. Hanley |
| Wiretapper | 1955 | Charles Rumsden |
| Annie Oakley | 1955 | TV Series | Ralph Putnam / Jim Hayward |
| The Star and the Story | 1955 | TV Series | Glenn Booth |
| The Eternal Sea | 1955 | Capt. Walter Riley |
| Strange Lady in Town | 1955 | Slade Wickstrom |
| Science Fiction Theatre | 1955 | TV Series | Col. R.J. Barton |
| The Lone Ranger | 1950-1955 | TV Series | John Trent / Sheriff Tom Lowell / George Milliner / ... |
| Wyoming Renegades | 1955 | Charlie Veer |
| The Man Behind the Badge | 1955 | TV Series | Weston |
| The Whistler | 1955 | TV Series | Robert / Mark |
| Adventures of the Falcon | 1954-1955 | TV Series | Pete Caddy / Stacy Rogan / Thad Henderson |
| Public Defender | 1955 | TV Series | Jeff Thomas |
| Climax! | 1954 | TV Series | Uncle Gavin |
| Cry Vengeance | 1954 | Tino Morelli |
| Sitting Bull | 1954 | Col. Custer |
| The Big Chase | 1954 | Police Lt. Ned Daggert |
| The High and the Mighty | 1954 | Boyd, Public Relations (uncredited) |
| Stories of the Century | 1954 | TV Series | Bill Longley |
| Massacre Canyon | 1954 | Sergeant James Marlowe |
| The Lone Gun | 1954 | Hort Moran |
| Rails Into Laramie | 1954 | Telegraph Operator |
| The Loretta Young Show | 1954 | TV Series | Roger Stevens |
| Schlitz Playhouse | 1953-1954 | TV Series | Lt. Mark Randall / Col. Robert Edwards / Tom Babcock |
| The Pride of the Family | 1954 | TV Series |
| Mr. & Mrs. North | 1954 | TV Series | Professor Henry 'Stuffy' Barton |
| Hopalong Cassidy | 1954 | TV Series | Stacy Keller |
| The Pepsi-Cola Playhouse | 1953 | TV Series |
| Fireside Theatre | 1951-1953 | TV Series | Stafford / Dan / Joe / ... |
| Cavalcade of America | 1953 | TV Series |
| Sea of Lost Ships | 1953 | Helicopter Pilot |
| The All American | 1953 | Tate Hardy |
| Mexican Manhunt | 1953 | Dan McCracken |
| War Paint | 1953 | Trooper Clancy |
| Gun Belt | 1953 | Mel Dixon |
| Safari Drums | 1953 | Brad Morton |
| Your Jeweler's Showcase | 1953 | TV Series |
| Invaders from Mars | 1953 | Tall Cop Jackson Who Vanishes (uncredited) |
| Jack McCall, Desperado | 1953 | 'Wild' Bill Hickok |
| Big Town | 1953 | TV Series | Sheriff Keegan |
| San Antone | 1953 | Captain Garfield, U.S. Calvary |
| Torpedo Alley | 1952 | Lt. Dore Gates |
| Ride the Man Down | 1952 | Harve Garrison |
| The Ford Television Theatre | 1952 | TV Series | Art Cummings |
| Last Train from Bombay | 1952 | Kevin / Brian O'Hara (as Douglas R. Kennedy) |
| Chevron Theatre | 1952 | TV Series |
| Gruen Guild Theater | 1952 | TV Series |
| Hoodlum Empire | 1952 | Henchman Brinkley (uncredited) |
| Fort Osage | 1952 | George Keane |