The Gettysburg Address is a speech that U.S. President Abraham Lincoln delivered during the American Civil War at the dedication of the Soldiers' National Cemetery, now known as Gettysburg National Cemetery, in Gettysburg, Pennsylvania on the afternoon of November 19, 1863, four and a half months after the Union armies defeated Confederate forces in the Battle of Gettysburg, the Civil War's deadliest battle. It remains one of the best known speeches in American history.

Lincoln's carefully crafted but brief address, which was not even scheduled as the day's primary speech, came to be seen as one of the greatest and most influential statements on the American national purpose. In just 271 words, beginning with the now famous phrase "Four score and seven years ago,"‍ referring to the signing of the Declaration of Independence 87 years earlier, Lincoln described the U.S. as a nation "conceived in Liberty, and dedicated to the proposition that all men are created equal," and represented the Civil War as a test that would determine whether such a nation could endure. Lincoln extolled the sacrifices of those who died at Gettysburg in defense of those principles, and then urged that the nation ensure:

that these dead shall not have died in vain—that this nation, under God, shall have a new birth of freedom—and that government of the people, by the people, for the people, shall not perish from the earth.

Despite the prominent place of the speech in the history and popular culture of the United States, its exact wording is disputed. The five known manuscripts of the Gettysburg Address in Lincoln's hand differ in a number of details, and also differ from contemporary newspaper reprints of the speech. Nor is it precisely clear where, on the grounds of the Gettysburg cemetery, Lincoln delivered the address. Modern scholarship locates the speakers' platform at least 120 feet (36.58 m) away from the traditional site in Soldiers' National Cemetery at the Soldiers' National Monument, such that it stood entirely within the private, adjacent Evergreen Cemetery. A 2022 interpretation of photographs of the day, using 3D modeling software, has argued for a slightly different location—straddling the current fence around Evergreen Cemetery.