The only confirmed photo of Abraham Lincoln at Gettysburg (seated), taken about noon, just after Lincoln arrived and some three hours before he spoke. To Lincoln's right is his bodyguard, Ward Hill Lamon.

The Gettysburg Address is the most famous speech of U.S. President Abraham Lincoln and one of the most quoted speeches in United States history.^[1][2][3] It was delivered at the dedication of the Soldiers' National Cemetery in Gettysburg, Pennsylvania, on the afternoon of Thursday, November 19, 1863, during the American Civil War, four and a half months after the Union armies defeated those of the Confederacy at the decisive Battle of Gettysburg.

Abraham Lincoln's carefully crafted address, secondary to other presentations that day, came to be regarded as one of the greatest speeches in American history. In just over two minutes, Lincoln invoked the principles of human equality espoused by the Declaration of Independence and redefined the Civil War as a struggle not merely for the Union, but as "a new birth of freedom" that would bring true equality to all of its citizens, and that would also create a unified nation in which states' rights were no longer dominant.

Beginning with the now-iconic phrase "Four score and seven years ago...", Lincoln referred to the events of the Civil War and described the ceremony at Gettysburg as an opportunity not only to dedicate the grounds of a cemetery, but also to consecrate the living in the struggle to ensure that "government of the people, by the people, for the people, shall not perish from the earth".

Despite the speech's prominent place in the history and popular culture of the United States, the exact wording of the speech is disputed. The five known manuscripts of the Gettysburg Address differ in a number of details and also differ from contemporary newspaper reprints of the speech.