Credits

• 1990 · The Wonderful Wizard of Oz: The Making of a Movie Classic as Self (archive footage)
• 1974 · That's Entertainment! as (archive footage) (uncredited)
• 1950 · Key to the City as Fire Chief Duggan
• 1949 · The Great Sinner as Aristide Pitard
• 1948 · The Three Musketeers as King Louis XIII
• 1948 · Summer Holiday as Uncle Sid
• 1947 · Green Dolphin Street as Dr. Edmond Ozanne
• 1946 · Courage of Lassie as Harry MacBain
• 1946 · Lady Luck as William Audrey
• 1944 · Kismet as Narrator (voice)
• 1944 · The White Cliffs of Dover as Hiram Porter Dunn
• 1943 · Thousands Cheer as Dr. Frank Morgan
• 1943 · A Stranger in Town as John Josephus Grant
• 1942 · The Vanishing Virginian as Robert Yancey
• 1941 · Honky Tonk as Judge Cotton
• 1941 · Washington Melodrama as Calvin Claymore
• 1940 · Keeping Company as Harry C. Thomas
• 1940 · Boom Town as Luther Aldrich
• 1940 · The Mortal Storm as Professor Victor Roth
• 1940 · Hollywood: Style Center of the World as Self
• 1940 · Broadway Melody of 1940 as Bob Casey
• 1940 · The Shop Around the Corner as Hugo Matuschek
• 1939 · Henry Goes Arizona as Henry Conroy
• 1939 · The Wizard of Oz as Professor Marvel / The Wizard of Oz
• 1939 · Broadway Serenade as Cornelius Collier, Jr.
• 1938 · Sweethearts as Felix Lehman
• 1938 · The Crowd Roars as Brian McCoy
• 1938 · Port of Seven Seas as Panisse
• 1938 · Paradise for Three as Rudolph Tobler
• 1937 · Saratoga as Jesse Kiffmeyer
• 1937 · The Last of Mrs. Cheyney as Lord Francis Kelton
• 1936 · Dimples as Eustace Appleby
• 1936 · Dancing Pirate as Mayor Don Emilio Perena
• 1936 · The Great Ziegfeld as Billings
• 1935 · The Perfect Gentleman as Major Horatio Chatteris
• 1935 · Naughty Marietta as Gov. Gaspar d'Annard
• 1935 · The Good Fairy as Konrad
• 1934 · By Your Leave as Henry Smith
• 1934 · Success at Any Price as Raymond Merritt
• 1934 · The Cat and the Fiddle as Jules Daudet
• 1933 · Bombshell as Pops Burns
• 1933 · Broadway to Hollywood as Ted Hackett
• 1933 · The Nuisance as Dr. Buchanan Prescott
• 1933 · The Kiss Before the Mirror as Paul Held
• 1933 · Hallelujah, I'm a Bum as Mayor John Hastings
• 1933 · The Billion Dollar Scandal as John Dudley Masterson
• 1932 · Secrets of the French Police as François St. Cyr
• 1925 · The Man Who Found Himself as Lon Morris
• 1924 · Born Rich as Eugene Magnin
• 1918 · The Knife as Dr. Robert Manning
• 1916 · The Daring of Diana as John Briscoe
• 1916 · The Suspect as Sir Richard
• Future · Oz as Self / The Wizard (archive footage)
• 2000 · The Dark Side of the Rainbow as Professor Marvel (archive footage)
• 1990 · Myrna Loy: So Nice to Come Home To as (archive footage)
• 1983 · Çelik Pençe as
• 1949 · Any Number Can Play as Jim Kurstyn
• 1949 · The Stratton Story as Barney Wile
• 1946 · The Cockeyed Miracle as Sam Griggs
• 1945 · Yolanda and the Thief as Victor Budlow Trout
• 1945 · The Great Morgan as Himself
• 1944 · Casanova Brown as Mr. Ferris
• 1944 · Twenty Years After as (archive footage)
• 1943 · The Human Comedy as Willie Grogan
• 1942 · White Cargo as The Doctor
• 1942 · Tortilla Flat as The Pirate
• 1941 · The Wild Man of Borneo as J. Daniel 'Dan' Thompson
• 1940 · Hullabaloo as Frankie' Merriweather
• 1940 · The Ghost Comes Home as Vernon 'Vern' Adams
• 1939 · Balalaika as Ivan Danchenoff
• 1937 · Rosalie as King Fredrick Romanikov
• 1937 · Beg, Borrow or Steal as Ingraham Steward
• 1937 · Sunday Night at the Trocadero as Frank Morgan
• 1937 · The Emperor's Candlesticks as Colonel Baron Suroff
• 1936 · Piccadilly Jim as James Crocker, Sr. / Count Olav Osric
• 1936 · Trouble for Two as Colonel Geraldine
• 1935 · I Live My Life as G.P. Bentley
• 1935 · Escapade as Karl
• 1935 · Lazybones as Tom
• 1935 · Enchanted April as Mellersh Wilkins
• 1934 · There's Always Tomorrow as Joseph White
• 1934 · A Lost Lady as Daniel Forrester
• 1934 · The Affairs of Cellini as Alessandro, Duke of Florence
• 1934 · Sisters Under the Skin as John Hunter Yates
• 1933 · When Ladies Meet as Rogers
• 1933 · Best of Enemies as William Hartman
• 1933 · Reunion in Vienna as Dr. Anton King
• 1933 · Luxury Liner as Alex Stevenson
• 1932 · The Half-Naked Truth as Merle Farrell
• 1930 · Fast and Loose as Bronson Lenox
• 1930 · Laughter as C. Mortimer Gibson
• 1930 · Queen High as George Nettleton
• 1930 · Dangerous Nan McGrew as Doc Foster
• 1930 · Belle of the Night as
• 1927 · Love's Greatest Mistake as William Ogden
• 1925 · Scarlet Saint as Baron Badeau
• 1925 · The Crowded Hour as Bert Caswell
• 1924 · Manhandled as Arno Riccardi
• 1919 · The Golden Shower as Lester
• 1918 · At the Mercy of Men as Count Nicho
• 1917 · Raffles, the Amateur Cracksman as Bunny Manders
• 1917 · Baby Mine as Alfred
• 1917 · The Light in Darkness as Ramsey Latham
• 1917 · Who's Your Neighbor? as Dudley Carlton
• 1917 · The Girl Philippa as Halkett
• 1917 · A Modern Cinderella as Tom