Show Business at War is a short film made by The March of Time in 1943 to tout the United States film industry's contribution to the Second World War effort.

Al Jolson sings “Mammy”; Phil Baker asks the $64 question; Kay Kyser gives a clue; Rochester upsets his boss Jack Benny while Mary Livingstone taunts him and Don Wilson laughs.

Charlie McCarthy gets in Bergen’s hair, or tries to find it.

Darryl Zanuck, a colonel in the Signals Corps, and only recently back from North Africa, and John Ford, a Commander in the Navy, also doing photographic work on many fronts, are featured too.

The main credited stars are: Carole Lombard - Walt Disney - John Ford - Darryl F. Zanuck - Irving Berlin - Jack Benny - Olivia de Havilland - Marlene Dietrich - Deanna Durbin - Hedy Lamarr - Al Jolson - Carole Landis A multitude of other stars are seen but uncredited.