| James Stewart | .... | Glenn Miller |
| June Allyson | .... | Helen Berger Miller |
| Harry Morgan | .... | Chummy MacGregor |
| Charles Drake | .... | Don Haynes |
| George Tobias | .... | Si Schribman |
| Barton MacLane | .... | Gen. Hap Arnold, USAAF |
| Sig Ruman | .... | W. Kranz (pawnshop owner) |
| Irving Bacon | .... | Mr. Miller |
| James Bell | .... | Mr. Burger |
| Kathleen Lockhart | .... | Mrs. Miller |
| Katherine Warren | .... | Mrs. Burger |
| Frances Langford | .... | Herself |
| Louis Armstrong | .... | Himself |
| Ben Pollack | .... | Himself |
| Gene Krupa | .... | Himself |
| Barney Bigard | .... | Himself |
| James Young | .... | Himself |
| Marty Napoleon | .... | Himself |
| Arvell Shaw | .... | Himself |
| Cozy Cole | .... | Himself |
| Babe Russin | .... | Himself |
| Cicily Carter | .... | Bobbysoxer (uncredited) |
| William Challee | .... | Dispatch desk sergeant (uncredited) |
| Alan Copeland | .... | Himself (member, The Modernaires) (uncredited) |
| Kevin Corcoran | .... | Steve Miller, age 4 (uncredited) |
| Robert A. Davis | .... | Stevie Miller, age 2 (uncredited) |
| Hal K. Dawson | .... | Used car salesman (uncredited) |
| Bonnie Eddy | .... | Irene Miller (uncredited) |
| Phil Garris | .... | Joe Becker (uncredited) |
| Lisa Gaye | .... | Bobbysoxer (uncredited) |
| Bob Hamlin | .... | Himself (member, The Mellomen) (uncredited) |
| Ruth Hampton | .... | Young singer (uncredited) |
| Harry Harvey | .... | Doctor (uncredited) |
| Roland Jones | .... | Waiter (uncredited) |
| Paula Kelly | .... | Herself (uncredited) |
| Bill Lee | .... | Himself (member, The Mellomen) (uncredited) |
| Dayton Lummis | .... | Col. Spaulding, USAAF (uncredited) |
| The Modernaires | .... | Themselves (uncredited) |
| Leo Mostovoy | .... | Dr. Schillinger (uncredited) |
| Damian O'Flynn | .... | Col. Baker (uncredited) |
| Steve Pendleton | .... | Lt. Col. Bassell (uncredited) |
| Thurl Ravenscroft | .... | The Mellomen (uncredited) |
| Marion Ross | .... | Polly Haynes (uncredited) |
| Dick Ryan | .... | Auto garage repairman (uncredited) |
| Max Smith | .... | Himself (member, The Mellomen) (uncredited) |
| Anthony Sydes | .... | Herbert Miller (uncredited) |
| Deborah Sydes | .... | Joanee Dee Miller (uncredited) |
| Paul Tanner | .... | Himself (trombonist, Glenn Miller Band) |
| Nino Tempo | .... | Wilber Schwartz (uncredited) |
| Carl Vernell | .... | Musician technician (uncredited) |
| Carleton Young | .... | Adjutant General (uncredited) |