"God Bless America" is an American patriotic song written by Irving Berlin during World War I in 1918 and revised by him in the run-up to World War II in 1938. The later version was recorded by Kate Smith, becoming her signature song.

"God Bless America" takes the form of a prayer (with introductory lyrics noting that "as we raise our voices, in a solemn prayer") for God's blessing and peace for the nation ("stand beside her and guide her through the night").

Irving Berlin wrote the song at the end of World War I while serving in the U.S. Army at Camp Upton in Yaphank, New York. He decided that it did not fit in a revue called Yip Yip Yaphank, so he set it aside. The lyrics at that time included the line "Make her victorious on land and foam, God bless America..." as well as "Stand beside her and guide her to the right with the light from above".

Music critic Jody Rosen says that a 1906 Jewish dialect novelty song, "When Mose with His Nose Leads the Band," contains a six-note fragment that is "instantly recognizable as the opening strains of 'God Bless America'". He interprets this as an example of Berlin's "habit of interpolating bits of half-remembered songs into his own numbers." Berlin, born Israel Baline, had himself written several Jewish-themed novelty tunes.

In 1938, with the rise of Adolf Hitler, Berlin, who was Jewish and had arrived in the U.S. from Russia at the age of five, felt it was time to revive it as a "peace song", and it was introduced on an Armistice Day broadcast in 1938, sung by Kate Smith on her radio show. This song has become the performer's calling card. Berlin had made some minor changes; by this time, "to the right" might have been considered a call to the political right, so he substituted "through the night" instead. He also provided an introduction that is now rarely heard but which Smith always used: "While the storm clouds gather far across the sea / Let us swear allegiance to a land that's free / Let us all be grateful for a land so fair, / As we raise our voices in a solemn prayer." (In her first broadcast of the song, Kate Smith sang "that we're far from there" rather than "for a land so fair".) This was changed when Berlin published the sheet music in March 1939.

Woody Guthrie criticized the song, and in 1940 he wrote "This Land Is Your Land," originally titled "God Blessed America For Me," as a response. Anti-Semitic groups such as the Ku Klux Klan also protested against the song due to its authorship by a Jewish immigrant.

In 1943, Smith's rendition was featured in the patriotic musical film This is the Army along with other Berlin songs. The manuscripts in the Library of Congress reveal the evolution of the song from victory to peace. Berlin gave the royalties of the song to The God Bless America Fund for redistribution to Boy Scouts and Girl Scouts in New York City. Smith performed the song on her two NBC television series in the 1950s. "God Bless America" also spawned another of Irving Berlin's tunes, "Heaven Watch The Philippines," during the end of World War II. The Philippines was an American possession since 1898 and recently liberated from Japanese occupation; Berlin wrote it after he heard Filipinos singing a modified version of the song replacing "America" with "The Philippines."

The song was used early in the Civil Rights Movement as well as at labor rallies. During the 1960s counterculture, the song was increasingly used by Christian conservatives in the US to signal their opposition to secular liberalism and to silence dissenters who were speaking in favor of communism or in opposition to the U.S. involvement in the Vietnam War.