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| Title | Year | Status | Character |
|---|
| Front Row Center | 1956 | TV Series | Harry Cooper |
| Meet Me in Las Vegas | 1956 | Tom Culdane |
| Lux Video Theatre | 1956 | TV Series | Harry |
| Star Stage | 1956 | TV Series |
| The Square Jungle | 1955 | Pat Quaid |
| TV Reader's Digest | 1955 | TV Series | George Johnson |
| Magoo Makes News | 1955 | Short | Mr. Magoo (voice) |
| Rebel Without a Cause | 1955 | Frank Stark |
| Stage Door Magoo | 1955 | Short | Mr. Magoo (voice) |
| Francis in the Navy | 1955 | Cmdr. E.T. Hutch |
| Madcap Magoo | 1955 | Short | Mr. Magoo (voice) |
| Magoo Express | 1955 | Short | Mr. Magoo (voice) |
| I Married Joan | 1952-1955 | TV Series | Judge Bradley Stevens |
| Magoo's Check Up | 1955 | Short | Mr. Magoo (voice) |
| Destination Magoo | 1954 | Short | Mr. Magoo (voice) |
| Deep in My Heart | 1954 | Ben Judson |
| The Web | 1954 | TV Series |
| Kangaroo Courting | 1954 | Short | Mr. Magoo (voice) |
| Four Wheels, No Brakes | 1954 | Short | Television Quizmaster / New Car Salesman (voice, uncredited) |
| Magoo Goes Skiing | 1954 | Short | Mr. Magoo (voice) |
| Look Who's Driving | 1954 | Short | Charlie (voice, uncredited) |
| When Magoo Flew | 1954 | Short | Mr. Magoo (voice) |
| Geraldine | 1953 | Jason Ambrose |
| All Star Revue | 1953 | TV Series | Guest Comedic Actor |
| Magoo Slept Here | 1953 | Short | Mr. Magoo (voice) |
| Magoo's Masterpiece | 1953 | Short | Mr. Magoo (voice) |
| Safety Spin | 1953 | Short | Mr. Magoo (voice) |
| I Love Melvin | 1953 | Mergo |
| Angel Face | 1953 | District Attorney Judson |
| Above and Beyond | 1952 | Gen. Curtis E. LeMay |
| Captains Outrageous | 1952 | Short | Mr. Magoo (voice) |
| Androcles and the Lion | 1952 | Centurion |
| Hotsy Footsy | 1952 | Short | Mr. Magoo (voice) |
| Pete Hothead | 1952 | Short voice, uncredited |
| The Rose Bowl Story | 1952 | Michael 'Iron Mike' Burke |
| Pink and Blue Blues | 1952 | Short | Mr. Magoo (voice) |
| Don't Bother to Knock | 1952 | Peter Jones |
| Pat and Mike | 1952 | Charles Barry |
| The Dog Snatcher | 1952 | Short | Mr. Magoo (voice) |
| Deadline - U.S.A. | 1952 | Jim Cleary |
| Here Come the Nelsons | 1952 | Joe Randolph |
| Sloppy Jalopy | 1952 | Short | Mr. Magoo (voice) |
| I Want You | 1951 | Harvey Landrum |
| Grizzly Golfer | 1951 | Short | Mr. Magoo (voice) |
| I'll See You in My Dreams | 1951 | Sam Harris |
| The Man with a Cloak | 1951 | Flaherty |
| Fuddy Duddy Buddy | 1951 | Short | Mr. Magoo (voice, uncredited) |
| His Kind of Woman | 1951 | Myron Winton |
| Iron Man | 1951 | Max Watkins |
| Hollywood Story | 1951 | Mitch Davis |
| Plutopia | 1951 | Short | Milton (voice, uncredited) |
| Bright Victory | 1951 | Bill Grayson |
| Half Angel | 1951 | Michael Hogan |
| Barefaced Flatfoot | 1951 | Short | Mr. Magoo (voice, uncredited) |
| M | 1951 | The Mayor |
| Bungled Bungalow | 1951 | Short | Mr. Magoo (voice) |
| The Killer That Stalked New York | 1950 | Willie Dennis (uncredited) |
| Emergency Wedding | 1950 | Ed Hamley |
| Trouble Indemnity | 1950 | Short | Mr. Magoo (voice) |
| The Miner's Daughter | 1950 | Short | John Harvard (voice, uncredited) |
| Customs Agent | 1950 | Shanghai Chief Agent Thomas Jacoby |
| Ma and Pa Kettle Go to Town | 1950 | Joseph 'Little Joe' Rogers |
| Spellbound Hound | 1950 | Short | Mr. Magoo (voice, uncredited) |
| Edgar Bergen with Charlie McCarthy | 1950 | TV Movie | Magistrate Backus |
| A Dangerous Profession | 1949 | Police Lt. Nick Ferrone / Narrator |
| Hollywood House | 1949 | TV Series | Hotel Manager |
| The Great Lover | 1949 | Higgins |
| Easy Living | 1949 | Dr. Franklin (as James Backus) |
| Father Was a Fullback | 1949 | Professor Sullivan (as James G. Backus) |
| Ragtime Bear | 1949 | Short | Mr. Magoo (voice, uncredited) |
| One Last Fling | 1949 | Howard Pritchard |
| A-Lad-in His Lamp | 1948 | Short | Genie (voice, uncredited) |
| Where Will You Hide? | 1948 | Short | Narrator |
| Gilligan's Island | 1964-1992 | TV Series | Thurston Howell III |
| Merrie Melodies: Starring Bugs Bunny and Friends | 1990 | TV Series | Smoky the Genie (voice) |
| The Bugs Bunny and Tweety Show | 1986 | TV Series | Smoky the Genie (voice) |
| The Enchanted Journey | 1984 | Gamun (voice) |
| Prince Jack | 1984 | Dealy |
| Trapper John, M.D. | 1983 | TV Series | Gus |
| Gilligan's Planet | 1982 | TV Series | Thurston Howell III |
| Slapstick of Another Kind | 1982 | President of the U.S. |
| The Love Boat | 1978-1981 | TV Series | Mr. Landers / Mr. Marvin Waterman |
| The Harlem Globetrotters on Gilligan's Island | 1981 | TV Movie | Thurston Howell III |
| There Goes the Bride | 1980 | Mr. Perkins |
| Fantasy Island | 1978-1980 | TV Series | H.H. Moran / Cap Truman |
| C.H.O.M.P.S. | 1979 | Mr. Gibbs |
| The Electric Horseman | 1979 | Mr. Magoo (voice, uncredited) |
| Eischied | 1979 | TV Series |
| The Rebels | 1979 | TV Movie | John Hancock |
| The Castaways on Gilligan's Island | 1979 | TV Movie | Thurston Howell III |
| $weepstake$ | 1979 | TV Series | Major Adams |
| Angels' Brigade | 1979 | Cmdr. Lindsey March |
| Flying High | 1979 | TV Series | Man |
| The Gift of the Magi | 1978 | TV Movie |
| Rescue from Gilligan's Island | 1978 | TV Movie | Thurston Howell III |
| Good Guys Wear Black | 1978 | Doorman |
| What's New, Mr. Magoo? | 1977 | TV Series | Mr. Magoo |
| Have I Got a Christmas for You | 1977 | TV Movie | Kevin Grady |
| Pete's Dragon | 1977 | The Mayor |
| CHiPs | 1977 | TV Series | Weitzman |
| Charlie's Angels | 1977 | TV Series | Iggy |
| Never Con a Killer | 1977 | TV Movie | Stanley Bunch |
| The Feather and Father Gang | 1977 | TV Series | Stanley Bunch |
| The Magic Pony | 1977 | The Tsar (voice) |
| Ark II | 1976 | TV Series | Arnie Pool |
| ABC Afterschool Specials | 1976 | TV Series | Dr. Flamel |
| Police Story | 1975-1976 | TV Series | Pollack / Jake Mandel |
| Friday Foster | 1975 | Enos Griffith |
| The New Adventures of Gilligan | 1974-1975 | TV Series | Thurston Howell III |
| The Ghost Busters | 1975 | TV Series | Eric, the Red |
| Ellery Queen | 1975 | TV Series | Howard Biggers |
| Mobile One | 1975 | TV Series | Macklin |
| Joe Forrester | 1975 | TV Series | Jake Mandel |
| New Zoo Revue | 1975 | TV Series | Traveling Salesman |
| Crazy Mama | 1975 | Mr. Albertson |
| Cop on the Beat | 1975 | TV Movie | Jake Mandel |
| Gunsmoke | 1975 | TV Series | Reverend Sims |
| Kolchak: The Night Stalker | 1975 | TV Series | Herb Bresson |
| Harry O | 1975 | TV Series | Ziggy |
| Chico and the Man | 1975 | TV Series | Harold Erickson |
| Yes, Virginia, There Is a Santa Claus | 1974 | TV Short | Narrator / Santa Claus (voice) |
| Marcus Welby, M.D. | 1974 | TV Series | Bill |
| The Brady Bunch | 1971-1974 | TV Series | Zaccariah T. Brown / Harry Mathews |
| Goodnight Jackie | 1974 | Mr. Landry |
| Miracle on 34th Street | 1973 | TV Movie | Shellhammer |
| The Girl Most Likely to... | 1973 | TV Movie | Tilson |
| Medical Center | 1973 | TV Series | Dr. Danvers |
| Mod Squad | 1973 | TV Series | Emile Wade |
| Magic Carpet | 1972 | TV Movie | George Benson |
| Of Thee I Sing | 1972 | TV Movie | Senator Robert F. Lyons |
| Now You See Him, Now You Don't | 1972 | Timothy Forsythe |
| Alias Smith and Jones | 1972 | TV Series | Joseph P. Sterling |
| Getting Away from It All | 1972 | TV Movie | Mike Lorimar |
| Young Dr. Kildare | 1972 | TV Series | Jake Langley |
| Love, American Style | 1970 | TV Series | Jerry (segment "Love and the Understanding") / Jerry Franks (segment "Love and the Marriage Counselor") |
| Uncle Sam Magoo | 1970 | TV Movie | Mr. Magoo (voice) |
| Myra Breckinridge | 1970 | Doctor |
| Cockeyed Cowboys of Calico County | 1970 | Staunch |
| Nanny and the Professor | 1970 | TV Series | Dr. Charles Walters |
| I Dream of Jeannie | 1970 | TV Series | General Charles Fitzhugh |
| Wake Me When the War Is Over | 1969 | TV Movie | Colonel |
| Hello Down There | 1969 | T.R. Hollister |
| The Good Guys | 1969 | TV Series | Henry Arsdale |
| The Wild Wild West | 1969 | TV Series | Fabian Swanson |
| Blondie | 1968-1969 | TV Series | J.C. Dithers
Mr. Dithers |
| The Bugs Bunny/Road Runner Hour | 1968 | TV Series | Smoky the Genie (voice) |
| Where Were You When the Lights Went Out? | 1968 | Tru-Blue Lou |
| I Spy | 1968 | TV Series | Tom Mathews |
| Daniel Boone | 1968 | TV Series | Will Scataway |
| Accidental Family | 1967 | TV Series | Uncle Fred |
| Damn Yankees! | 1967 | TV Movie | Benny Van Buren |
| Hurry Sundown | 1967 | Carter Sillens |
| The Garry Moore Show | 1967 | TV Series |
| Billie | 1965 | Howard G. Carol |
| Fluffy | 1965 | Sergeant |
| The Famous Adventures of Mr. Magoo | 1964-1965 | TV Series | Mr. Magoo / Squinty Eyes |
| John Goldfarb, Please Come Home! | 1965 | Miles Whitepaper |
| Burke's Law | 1963-1964 | TV Series | Herkimer Witt / Pork Pie Hannigan / Harold Mason |
| Advance to the Rear | 1964 | Gen. Willoughby |
| Espionage | 1964 | TV Series | McAvoy |
| Arrest and Trial | 1964 | TV Series | Sam Thayer |
| The DuPont Show of the Week | 1964 | TV Series | Big Boss Buddy Foy |
| Mr. Magoo in Sherwood Forest | 1964 | Mr. Magoo (voice) |
| The Wheeler Dealers | 1963 | Bullard Bear |
| Sunday in New York | 1963 | Chief Pilot Drysdale |
| It's a Mad Mad Mad Mad World | 1963 | Tyler Fitzgerald |
| Johnny Cool | 1963 | Louis Murphy |
| The United States Steel Hour | 1963 | TV Series | Michael John McKane |
| The Beverly Hillbillies | 1963 | TV Series | Marty Van Ransohoff |
| Critic's Choice | 1963 | Dr. William Von Hagedorn |
| My Six Loves | 1963 | Sheriff |
| Operation Bikini | 1963 | Bosun's Mate Ed Fennelly |
| The Dick Powell Theatre | 1963 | TV Series | Monte |
| McKeever & the Colonel | 1963 | TV Series | J.C. Medbury |
| Mister Magoo's Christmas Carol | 1962 | TV Movie | Ebenezer Scrooge
Mr. Magoo (voice) |
| The Wonderful World of the Brothers Grimm | 1962 | The King ('The Dancing Princess') |
| Zotz! | 1962 | Horatio Kellgore |
| Boys' Night Out | 1962 | Peter Bowers |
| The Horizontal Lieutenant | 1962 | Cmdr. Jeremiah Hammerslag |
| Follow the Sun | 1962 | TV Series | N.N. Nelson |
| The Lady and the Stock Exchange | 1962 | Documentary short | Fictional Character |
| Cain's Hundred | 1961 | TV Series | Karl Bigger |
| The Errand Boy | 1961 | Mr. Arbutt (voice, uncredited) |
| Maverick | 1961 | TV Series | Joe Wheelwright |
| The Jim Backus Show | 1960-1961 | TV Series | Mike O'Toole |
| The Bugs Bunny Show | 1960 | TV Series | Smoky the Genie (voice) |
| Make Room for Daddy | 1960 | TV Series | Jim Fletcher |
| The Untouchables | 1960 | TV Series | William Norbert |
| 77 Sunset Strip | 1960 | TV Series | Maury Samuels |
| Ice Palace | 1960 | Dave Husack |
| Inside Magoo | 1960 | Short | Mr. Magoo / Himself |
| Mister Magoo | 1960 | TV Series | Mr. Magoo |
| 1001 Arabian Nights | 1959 | Uncle Abdul Azziz Magoo (voice) |
| A Private's Affair | 1959 | Jim Gordon |
| The Big Operator | 1959 | Cliff Heldon |
| Terror Faces Magoo | 1959 | Short | Mr. Magoo (voice) |
| The Wild and the Innocent | 1959 | Mr. Forbes |
| Ask Any Girl | 1959 | Maxwell |
| Magoo's Lodge Brother | 1959 | Short | Mr. Magoo (voice) |
| Merry Minstrel Magoo | 1959 | Short | Mr. Magoo (voice) |
| The Millionaire | 1959 | TV Series | Henry Banning |
| Magoo's Homecoming | 1959 | Short | Mr. Magoo (voice) |
| Goodyear Theatre | 1959 | TV Series | Jim Cannaday |
| Bwana Magoo | 1959 | Short | Mr. Magoo (voice) |
| Playhouse 90 | 1958 | TV Series | Jerry |
| Gumshoe Magoo | 1958 | Short | Mr. Magoo (voice) |
| Love Comes to Magoo | 1958 | Short | Mr. Magoo (voice) |
| Macabre | 1958 | Police Chief Jim Tyloe |
| Magoo's Cruise | 1958 | Short | Mr. Magoo (voice) |
| Magoo's Three-Point Landing | 1958 | Short | Mr. Magoo / Air Traffic Controller (voice) |
| The High Cost of Loving | 1958 | Paul Mason |
| The Explosive Mr. Magoo | 1958 | Short | Mr. Magoo (voice) |
| Studio One in Hollywood | 1957-1958 | TV Series | Tim McTaggart / Father |
| Scoutmaster Magoo | 1958 | Short | Mr. Magoo (voice) |
| Magoo's Young Manhood | 1958 | Short | Mr. Magoo (voice) |
| Magoo's Private War | 1957 | Short | Mr. Magoo (voice) |
| Magoo's Moose Hunt | 1957 | Short | Mr. Magoo (voice) |
| The Pied Piper of Hamelin | 1957 | TV Movie | King's Emissary |
| Eighteen and Anxious | 1957 | Harvey Graham |
| Rock-Hound Magoo | 1957 | Short | Mr. Magoo (voice) |
| Magoo Saves the Bank | 1957 | Short | Mr. Magoo (voice) |
| The Gale Storm Show: Oh! Susanna | 1957 | TV Series | Arthur Hutchins |
| Magoo's Masquerade | 1957 | Short | Mr. Magoo (voice) |
| Man of a Thousand Faces | 1957 | Clarence Locan |
| Magoo's Glorious Fourth | 1957 | Short | Mr. Magoo (voice) |
| Magoo Breaks Par | 1957 | Short | Mr. Magoo (voice) |
| Matador Magoo | 1957 | Short | Mr. Magoo (voice) |
| Matinee Theatre | 1956-1957 | TV Series |
| Climax! | 1957 | TV Series | Detective Herman |
| Robert Montgomery Presents | 1957 | TV Series | Lucus Edgerton |
| Magoo Goes Overboard | 1957 | Short | Mr. Magoo (voice) |
| Top Secret Affair | 1957 | Col. Homer W. Gooch |
| Meet Mother Magoo | 1956 | Short | Mr. Magoo (voice) |
| The Great Man | 1956 | Nick Cellantano |
| You Can't Run Away from It | 1956 | Danker |
| The Girl He Left Behind | 1956 | Sgt. Hanna |
| The Opposite Sex | 1956 | Psychiatrist |
| Magoo's Problem Child | 1956 | Short | Mr. Magoo (voice) |
| Conflict | 1956 | TV Series | Dandy Summers |
| Warner Brothers Presents | 1956 | TV Series |
| Trailblazer Magoo | 1956 | Short | Mr. Magoo (voice) |
| Magoo's Puddle Jumper | 1956 | Short | Mr. Magoo (voice) |
| Magoo Beats the Heat | 1956 | Short | Mr. Magoo (voice) |
| The Naked Hills | 1956 | Willis Haver |
| Calling Doctor Magoo | 1956 | Short | Mr. Magoo (voice) |
| Magoo Goes West | 1956 | Short | Mr. Magoo (voice) |
| Magoo's Canine Mutiny | 1956 | Short | Mr. Magoo (voice) |