| Jean Arthur | Alice Sycamore |
| Lionel Barrymore | Grandpa Martin Vanderhof |
| James Stewart | Tony Kirby |
| Edward Arnold | Anthony P. Kirby |
| Mischa Auer | Kolenkhov |
| Ann Miller | Essie Carmichael |
| Spring Byington | Penny Sycamore |
| Samuel S. Hinds | Paul Sycamore |
| Donald Meek | Poppins |
| H.B. Warner | Ramsey |
| Halliwell Hobbs | DePinna |
| Dub Taylor | Ed Carmichael |
| Mary Forbes | Mrs. Anthony P. Kirby |
| Lillian Yarbo | Rheba |
| Eddie Anderson | Donald |
| Clarence Wilson | John Blakely |
| Joseph Swickard | Professor |
| Ann Doran | Maggie O'Neill |
| Christian Rub | Schmidt |
| Bodil Rosing | Mrs. Schmidt |
| Charles Lane | Wilbur G. Henderson, IRS Agent |
| Henry Davenport | Judge |
| Byron Foulger | Kirby's Assistant (uncredited) |
| Ian Wolfe | Kirby's Secretary (uncredited) |
| Ward Bond | Mike, the Detective (uncredited) |
An eccentric patriarch meets the stuffy parents of his granddaughter's fiance .
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