| Title | Year | Status | Character |
|---|
| They Died with Their Boots On | 1941 | | Lt. Frazier (uncredited) |
| Blues in the Night | 1941 | | Billiard Player (uncredited) |
| The Maltese Falcon | 1941 | | Reporter (uncredited) |
| Navy Blues | 1941 | | Ensign Walters (uncredited) |
| Passage from Hong Kong | 1941 | | Watson (uncredited) |
| International Squadron | 1941 | | Radio Operator (uncredited) |
| Dive Bomber | 1941 | | Pilot Telling Joe 'Tim Landed RAF Plane' (uncredited) |
| Manpower | 1941 | | Power Company Telephone Operator (uncredited) |
| Highway West | 1941 | | Frank Carson - Murdered Cashier (uncredited) |
| Bullets for O'Hara | 1941 | | Richard Palmer (as DeWolf Hopper) |
| The Bride Came C.O.D. | 1941 | | Keenan's Pilot (as DeWolf Hopper) |
| Throwing a Party | 1941 | Short | |
| Sockaroo | 1941 | Short | |
| Affectionately Yours | 1941 | | Airline Attendant (uncredited) |
| Strange Alibi | 1941 | | Apartment House Clerk (uncredited) |
| A Shot in the Dark | 1941 | | Reporter (uncredited) |
| Knockout | 1941 | | First Reporter (uncredited) |
| Here Comes Happiness | 1941 | | Best Man (as DeWolf Hopper) |
| Footsteps in the Dark | 1941 | | Police Secretary (uncredited) |
| Flight from Destiny | 1941 | | Travin (as DeWolf Hopper) |
| The Case of the Black Parrot | 1941 | | Ship's officer reporting false alarm (uncredited) |
| Santa Fe Trail | 1940 | | Officer (scenes deleted) |
| Lady with Red Hair | 1940 | | Lyceum Theater Attendant (uncredited) |
| Always a Bride | 1940 | | Man at Campaign Meeting Carrying Michael (uncredited) |
| The Flag of Humanity | 1940 | Short | Sentry (uncredited) |
| Knute Rockne All American | 1940 | | New York Reporter When Knute is Ill (uncredited) |
| No Time for Comedy | 1940 | | First-Nighter (uncredited) |
| Money and the Woman | 1940 | | J.L. Burns, Bank Depositor (uncredited) |
| Ladies Must Live | 1940 | | Joe Barton (as DeWolf Hopper) |
| Pony Express Days | 1940 | Short | St. Joseph Telegrapher (uncredited) |
| The Man Who Talked Too Much | 1940 | | Reporter #2 (uncredited) |
| Gambling on the High Seas | 1940 | | Police Boat Radio Operator (uncredited) |
| Brother Orchid | 1940 | | 2nd Reporter on Return Ship (uncredited) |
| Flight Angels | 1940 | | Lefty (as DeWolf Hopper) |
| Tear Gas Squad | 1940 | | George (as DeWolf Hopper) |
| 'Til We Meet Again | 1940 | | Man (uncredited) |
| The Singing Dude | 1940 | Short | Cowboy (uncredited) |
| Virginia City | 1940 | | Lieutenant Reporting Murrell's Attack (uncredited) |
| Castle on the Hudson | 1940 | | Reporter (uncredited) |
| Calling Philo Vance | 1940 | | Clerk at Hotel Nino in Chicago (uncredited) |
| The Fighting 69th | 1940 | | Private Turner (as DeWolf Hopper) |
| Invisible Stripes | 1939 | | Society Gent in Top Hat (uncredited) |
| A Child Is Born | 1939 | | Intern Going to See Operation (uncredited) |
| The Return of Doctor X | 1939 | | Interne (as DeWolf Hopper) |
| On Dress Parade | 1939 | | Soldier Getting Radio Report from H4 (uncredited) |
| Pride of the Blue Grass | 1939 | | Joe (as DeWolf Hopper) |
| On Your Toes | 1939 | | Ronald - Peggy's Escort (uncredited) |
| Espionage Agent | 1939 | | Student (uncredited) |
| Dust Be My Destiny | 1939 | | Reporter (uncredited) |
| Nancy Drew and the Hidden Staircase | 1939 | | Reporter (as DeWolf Hopper) |
| Angels Wash Their Faces | 1939 | | Photographer (uncredited) |
| The Bill of Rights | 1939 | Short | Courier (uncredited) |
| The Old Maid | 1939 | | John (as DeWolf Hopper) |
| The Cowboy Quarterback | 1939 | | Handsome Sam Saxon (as DeWolf Hopper) |
| Daughters Courageous | 1939 | | Striped-Shirted Man at Beach (uncredited) |
| Midnight | 1939 | | Flammarions' Party Guest (uncredited) |
| Stagecoach | 1939 | | Sergeant (uncredited) |
| Mystery House | 1938 | | Lal Killian |
| Love, Honor and Behave | 1938 | | Yale Tennis Player (uncredited) |
| Daredevil Drivers | 1938 | | Neeley Bus Driver |
| The Adventurous Blonde | 1937 | | Matt |
| Over the Goal | 1937 | | Ken Thomas |
| Love Is on the Air | 1937 | | Eddie Gould |
| Back in Circulation | 1937 | | Pete Eddington - a Reporter (uncredited) |
| The Footloose Heiress | 1937 | | Jack Pierson |
| Mr. Dodd Takes the Air | 1937 | | Second Production Manager (uncredited) |
| Public Wedding | 1937 | | Anthony (Tony) Burke |
| Dick Tracy | 1937 | | Dirigible Pilot (uncredited) |
| Join the Marines | 1937 | | Marine (uncredited) |
| Larceny on the Air | 1937 | | Announcer (as De Wolf Hopper) |
| Beware of Ladies | 1936 | | Reporter (uncredited) |
| The Accusing Finger | 1936 | | Reporter (as DeWolf Hopper Jr.) |
| Easy to Take | 1936 | | Radio Monitor Room Man (uncredited) |
| The Big Broadcast of 1937 | 1936 | | Ship's Officer (uncredited) |
| Murder with Pictures | 1936 | | Photographer (uncredited) |
| The King Steps Out | 1936 | | Soldier (uncredited) |
| Sunshine Dad | 1916 | | Infant in carriage (as DeWolf Hopper Jr.) |
| Myra Breckinridge | 1970 | | Judge Frederic D. Cannon (uncredited) |
| Perry Mason | 1957-1966 | TV Series | Paul Drake |
| Studio 57 | 1956-1957 | TV Series | Kip |
| Slim Carter | 1957 | | Joe Brewster |
| 20 Million Miles to Earth | 1957 | | Col. Robert Calder |
| The Deadly Mantis | 1957 | | Dr. Nedrick Jackson |
| The Joseph Cotten Show: On Trial | 1957 | TV Series | Arnold Bait |
| Schlitz Playhouse | 1957 | TV Series | Dan Mailer |
| The Restless Gun | 1957 | TV Series | |
| Matinee Theatre | 1956 | TV Series | |
| Lux Video Theatre | 1955-1956 | TV Series | George / Jim Johanson / Brad Scott |
| The Bad Seed | 1956 | | Col. Kenneth Penmark |
| Jane Wyman Presents The Fireside Theatre | 1956 | TV Series | Rick Gordon |
| Gunsmoke | 1956 | TV Series | Tasker / John Henry Jordan |
| The First Texan | 1956 | | William Barrett Travis |
| The Millionaire | 1956 | TV Series | Capt. Jonathan Carroll |
| Good-bye, My Lady | 1956 | | Walden Grover |
| Celebrity Playhouse | 1956 | TV Series | |
| The 20th Century-Fox Hour | 1956 | TV Series | Philip Harland |
| Fury | 1956 | TV Series | Dr. Steve Brown / Steve Wilson |
| Casablanca | 1955 | TV Series | William Randall |
| Warner Brothers Presents | 1955 | TV Series | Wilson |
| Rebel Without a Cause | 1955 | | Judy's Father |
| One Desire | 1955 | | 'Mac' MacBain |
| The Ford Television Theatre | 1955 | TV Series | Joe Cramer |
| Robbers' Roost | 1955 | | Robert Bell |
| Conquest of Space | 1955 | | Dr. George Fenton |
| Track of the Cat | 1954 | | Arthur Bridges |
| This Is My Love | 1954 | | District Attorney |
| Sitting Bull | 1954 | | Charles Wentworth (as Bill Hopper) |
| The High and the Mighty | 1954 | | Roy (as William Dewolf Hopper) |
| Mayor of the Town | 1954 | TV Series | Girard |
| The Last Ride | 1944 | | Swank, Mechanic / Henchman (uncredited) |
| Murder on the Waterfront | 1943 | | First Sentry (uncredited) |
| Action in the North Atlantic | 1943 | | Canadian Soldier (uncredited) |
| Air Force | 1943 | | Sergeant (uncredited) |
| The Hard Way | 1943 | | Hotel Desk Clerk (uncredited) |
| Gentleman Jim | 1942 | | Undetermined Role (uncredited) |
| Beyond the Line of Duty | 1942 | Short | University of Texas Classmate (uncredited) |
| You Can't Escape Forever | 1942 | | Soldier (uncredited) |
| Desperate Journey | 1942 | | Radio Operator (uncredited) |
| Across the Pacific | 1942 | | Orderly (uncredited) |
| Divide and Conquer | 1942 | Short | Minor Role (uncredited) |
| Busses Roar | 1942 | | Dark-Haired Sailor at Bar (uncredited) |
| Secret Enemies | 1942 | | Agent (uncredited) |
| Escape from Crime | 1942 | | Hastings (uncredited) |
| Spy Ship | 1942 | | Reporter (uncredited) |
| Juke Girl | 1942 | | Atlanta Postal Clerk (uncredited) |
| Yankee Doodle Dandy | 1942 | | Reporter (uncredited) |
| Larceny, Inc. | 1942 | | Traffic Policeman (uncredited) |
| Murder in the Big House | 1942 | | Reporter (uncredited) |
| Lady Gangster | 1942 | | John (as DeWolf Hopper) |
| The Male Animal | 1942 | | Reporter on Porch (uncredited) |
| Bullet Scars | 1942 | | Citizens Bank Teller (uncredited) |
| You're in the Army Now | 1941 | | Supply Man - Gas Masks (uncredited) |
| The Body Disappears | 1941 | | Terrence Abbott (as DeWolf Hopper) |
| All Through the Night | 1941 | | Reporter (uncredited) |
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