 | Judy Garland als Nellie Noonan Kelly / Little Nellie Kelly |
 | George Murphy als Jerry Kelly |
 | Charles Winninger als Michael Noonan |
 | Douglas McPhail als Dennis Fogarty |
 | Arthur Shields als Timothy Fogarty |
 | Rita Page als Mary Fogarty |
 | Forrester Harvey als Moriarity |
 | James Burke als Sergeant McGowan |
 | George Watts als Keevan |
| Ernie Alexander als Expectant Father (uncredited) |
| Bill Armstrong als Ireland Crony (uncredited) |
 | Hooper Atchley als Police Surgeon (uncredited) |
 | Barbara Bedford als Miss Wilson the Nurse with Baby (uncredited) |
| Margaret Bert als Reception Nurse Miss Deane (uncredited) |
 | Edward Biby als Party Guest (uncredited) |
| Henry Blair als Dennis Fogarty as a Child (uncredited) |
 | Sven Hugo Borg als Immigrant at Citizenship Ceremony (uncredited) |
| Robert Bradford als Singer in 'Nellie Kelly I Love You' (uncredited) |
| James Carlisle als Party Guest (uncredited) |
| Larry Clifford als Irish Crony in Pub (uncredited) |
| Earl Covert als Singer in 'Nellie Kelly I Love You' (uncredited) |
 | Joseph Crehan als Police Commissioner O'Brien (uncredited) |
| Vondell Darr als Girl Dancing with Boy at Dance (uncredited) |
| Tom Dillon als Father Malone (uncredited) |
 | George Guhl als Postman (uncredited) |
 | Charles Halton als Second Judge (uncredited) |
| Hubert Head als Singer in 'Nellie Kelly I Love You' (uncredited) |
 | Edward Hearn als Second Court Clerk (uncredited) |
| George Hoagland als Party Guest (uncredited) |
 | Robert Homans als Dooley Pub Owner in Ireland (uncredited) |
 | Shep Houghton als Party Guest (uncredited) |
| Bob Ingersoll als Irish Crony in Pub (uncredited) |
 | Robert Emmett Keane als Dr. Walton (uncredited) |
 | Milton Kibbee als First Court Clerk (uncredited) |
 | Cathy Lewis als Western Union Operator (uncredited) |
| Charles McAvoy als Policeman (uncredited) |
 | George McKay als Bill a Workman at Fogarty's (uncredited) |
 | Sidney Miller als Boy at Dance (uncredited) |
 | Howard M. Mitchell als Detective Boyd (uncredited) |
| Pat Moriarity als Workman at Fogarty's (uncredited) |
| Edmund Mortimer als Guest at Policeman's Ball (uncredited) |
| Norman Nielson als Singer in 'Nellie Kelly I Love You' (uncredited) |
 | Frank O'Connor als Irish Crony in Pub (uncredited) |
 | Pat O'Malley als Mounted Policeman (uncredited) |
 | Lee Phelps als Detective Barter (uncredited) |
| John Power als Irish Crony in Pub (uncredited) |
 | John Raitt als Intern (uncredited) |
 | Bob Reeves als Party Guest (uncredited) |
| Peggy Remington als Party Guest (uncredited) |
 | Addison Richards als Naturalization Judge (uncredited) |
 | Cyril Ring als Man Bumped by Dennis (uncredited) |
| Mel Ruick als Bandleader (uncredited) |
 | Harry Semels als Immigrant at Citizenship Ceremony (uncredited) |
 | Almira Sessions als Nellie's Nurse Miss Corrigan (uncredited) |
 | Cap Somers als Party Guest (uncredited) |
 | Douglas Spencer als Policeman in Dance Line (uncredited) |
| Norman Taurog | Director |
| George M. Cohan | Theatre Play |
| Jack McGowan | Screenplay |
| Ray June | Director of Photography |
| Arthur Freed | Producer |
| Dolly Tree | Costume Design |
| Gile Steele | Costume Design |
