Alexander Gardner (October 17, 1821 – December 10, 1882) was a Scottish photographer who emigrated to the United States in 1856, where he began to work full-time in that profession. He is best known for his photographs of the American Civil War, U.S. President Abraham Lincoln, and the execution of the conspirators to Lincoln's assassination.
In 1866, Gardner published a two-volume work, Gardner's Photographic Sketch Book of the Civil War. Each volume contained 50 hand-mounted original prints. Not all photographs were Gardner's; he credited the negative producer and the positive print printer.