| James Cagney | ... | George M. Cohan |
| Joan Leslie | ... | Mary |
| Walter Huston | ... | Jerry Cohan |
 | Richard Whorf | ... | Sam Harris |
| Irene Manning | ... | Fay Templeton |
| George Tobias | ... | Dietz |
| Rosemary DeCamp | ... | Nellie Cohan |
| Jeanne Cagney | ... | Josie Cohan |
| Frances Langford | ... | Singer |
| George Barbier | ... | Erlanger |
| S.Z. Sakall | ... | Schwab |
| Walter Catlett | ... | Theatre Manager |
| Douglas Croft | ... | George M. Cohan, As a Boy of 13 |
| Eddie Foy Jr. | ... | Eddie Foy |
| Minor Watson | ... | Albee |
| Chester Clute | ... | Goff |
| Odette Myrtil | ... | Madame Bartholdi |
| Patsy Parsons | ... | Josie Cohan, As a Girl of 12 (as Patsy Lee Parsons) |
| Jack Young | ... | The President (as Capt. Jack Young) |
| rest of cast listed alphabetically: |
| Eddie Acuff | ... | Reporter (uncredited) |
| Murray Alper | ... | Wiseguy (uncredited) |
| Ernest Anderson | ... | George M. Cohan's valet (uncredited) |
| Vivian Austin | ... | Pianist (uncredited) |
| Leon Belasco | ... | Magician (uncredited) |
| Brooks Benedict | ... | Dressing room guest (uncredited) |
| Henry Blair | ... | George M. Cohan at 7 (uncredited) |
| Walter Brooke | ... | Reporter (uncredited) |
| Leslie Brooks | ... | Chorus girl ('Little Johnny Jones' number) (uncredited) |
| Georgia Carroll | ... | Betsy Ross (uncredited) |
| Glen Cavender | ... | Colony Opera House stagehand (uncredited) |
| Dick Chandlee | ... | Teenager (uncredited) |
| Spencer Charters | ... | Colony Opera House stage manager (uncredited) |
| Wallis Clark | ... | Theodore 'Teddy' Roosevelt (uncredited) |
| Alan Copeland | ... | Choirboy (uncredited) |
| William B. Davidson | ... | New York stage manager (uncredited) |
| Ann Doran | ... | Receptionist (uncredited) |
| Tom Dugan | ... | Actor, railroad station (uncredited) |
| Bill Edwards | ... | Reporter (uncredited) |
| Frank Faylen | ... | Sergeant on parade (last scene) (uncredited) |
| Pat Flaherty | ... | Sgt. Lewis (White House guard) (uncredited) |
| Robert Flatley | ... | Dancer (uncredited) |
| James Flavin | ... | Union Army veteran #1 on caisson (uncredited) |
| William Forrest | ... | Critic #1 (uncredited) |
| William Gillespie | ... | Baritone solo: Grand Old Flag number (uncredited) |
| Art Gilmore | ... | Franklin D. Roosevelt (voice) (uncredited) |
| Joe Gray | ... | (uncredited) |
| Creighton Hale | ... | Telegraph operator (uncredited) |
| John Hamilton | ... | Recruiting officer (uncredited) |
| Harry Hayden | ... | Dr. Llewellyn (uncredited) |
| Stuart Holmes | ... | Backstage actor, 'Peck's Bad Boy' (uncredited) |
| William Hopper | ... | Reporter (uncredited) |
| Joyce Horne | ... | Teenager (uncredited) |
| Charles Irwin | ... | Horse race announcer, 'Little Johnny Jones' number (uncredited) |
| Thomas E. Jackson | ... | Stage manager, 'Peck's Bad Boy' (uncredited) |
| Marijo James | ... | Sister act (uncredited) |
| Eddie Kane | ... | Wilson ('Little Johnny Jones' number) (uncredited) |
| Edward Keane | ... | Critic #2 (uncredited) |
| Dorothy Kelly | ... | Sister act (uncredited) |
| Fred Kelsey | ... | Irish cop in 'Pecks Bad Boy' (uncredited) |
| Phyllis Kennedy | ... | Fanny (uncredited) |
| Vera Lewis | ... | (uncredited) |
| Audrey Long | ... | Dietz & Goff's receptionst (uncredited) |
| Jerrie Lynne | ... | Singer (uncredited) |
| Hank Mann | ... | Peck's Bad Boy stagehand (uncredited) |
| Jo Ann Marlowe | ... | Josie Cohan, age 6 (uncredited) |
| Louis Mason | ... | Boarder (uncredited) |
| Frank Mayo | ... | Hotel clerk #2 (uncredited) |
| Lon McCallister | ... | (uncredited) |
| Edward McWade | ... | New York stage doorman (uncredited) |
| George Meeker | ... | Hotel clerk #1 (uncredited) |
| John 'Skins' Miller | ... | Horse race official (uncredited) |
| Frank Mills | ... | Pedestrian seeking newspaper (uncredited) |
| Bert Moorhouse | ... | Maurice Ruppe (music publisher) (uncredited) |
| Dolores Moran | ... | Girl (uncredited) |
| Charles Morton | ... | Friendly man at restaurant window on New Year's Eve (uncredited) |
| Jack Mower | ... | Backstage actor, 'Peck's Bad Boy' (uncredited) |
| Lee Murray | ... | Jockey (uncredited) |
| Garry Owen | ... | Army clerk (uncredited) |
| Paul Panzer | ... | Robinsons Theater stagehand (uncredited) |
| Francis Pierlot | ... | Dr. Anderson (uncredited) |
| Joyce Reynolds | ... | Teenager (uncredited) |
| Ruth Robinson | ... | Nurse (uncredited) |
| Clinton Rosemond | ... | White House butler (uncredited) |
| Thomas W. Ross | ... | Doctor (uncredited) |
| Syd Saylor | ... | Star boarder (uncredited) |
| Harry Seymour | ... | O'Rourke's Varieties stagehand (uncredited) |
| John Sheehan | ... | Boarder (uncredited) |
| Charles Smith | ... | Teenager (uncredited) |
| Elliott Sullivan | ... | Army recruiter examiner (uncredited) |
| Frank Sully | ... | Army recruiter (uncredited) |
| Sailor Vincent | ... | Schults, grocer in 'Peck's Bad Boy' (uncredited) |
| Dick Wessel | ... | Union Army veteran #2 on caisson (uncredited) |
| Leo White | ... | Backstage actor, 'Peck's Bad Boy' (uncredited) |
| Poppy Wilde | ... | Chorus girl ('Little Johnny Jones' number) (uncredited) |
| Dave Willock | ... | Stage Manager, 'Peck's Bad Boy' (uncredited) |
| Joan Winfield | ... | Sally (uncredited) |
| Jack Wise | ... | Boarder (uncredited) |
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