Rally Round the Flag, Boys! is a 1958 American comedy film directed by Leo McCarey from a screenplay he co-wrote with Claude Binyon, based on the 1957 novel of the same name by Max Shulman. Released by 20th Century Fox, the film stars Paul Newman, Joanne Woodward, Joan Collins, and Jack Carson. The title comes from a line in the song "Battle Cry of Freedom".

The "Battle Cry of Freedom", also known as "Rally 'Round the Flag", is a song written in 1862 by American composer George Frederick Root (1820–1895) during the American Civil War. A patriotic song advocating the causes of Unionism and abolitionism, it became so popular that composer H. L. Schreiner and lyricist W. H. Barnes adapted it for the Confederacy.