Frank Capra Director Jean Arthur Alice Sycamore Actor Lionel Barrymore Grandpa Martin Vanderhof Actor James Stewart Tony Kirby Actor Edward Arnold Anthony P. Kirby Actor Mischa Auer Kolenkhov Actor Ann Miller Essie Carmichael Actor Spring Byington Penny Sycamore Actor Samuel S. Hinds Paul Sycamore Actor Donald Meek Poppins Actor H.B. Warner Ramsey Actor Halliwell Hobbes DePinna Actor Dub Taylor Ed Carmichael Actor Mary Forbes Mrs. Anthony P. Kirby Actor Lillian Yarbo Rheba Actor Eddie "Rochester" Anderson Donald Actor Clarence Wilson John Blakely Actor Josef Swickard Professor Actor Ann Doran Maggie O'Neill Actor Christian Rub Schmidt Actor Bodil Rosing Mrs. Schmidt Actor Charles Lane Wilbur G. Henderson, IRS Agent Actor Henry Davenport Judge Actor Byron Foulger Kirby's Assistant (uncredited) Actor Ian Wolfe Kirby's Secretary (uncredited) Actor Ward Bond Mike, the Detective (uncredited) Actor George S. Kaufman Writer Moss Hart Writer Robert Riskin Writer Joseph Walker Cinematographer Gene Havlick Film Editing Dimitri Tiomkin Original Music Stephen Goosson Art Director Irene Costume Design Bernard Newman Costume Design