Lincoln's "Lost Speech" was a speech given by Abraham Lincoln at the Bloomington Convention on May 29, 1856, in Bloomington, Illinois. Traditionally regarded as lost because it was so engaging that reporters neglected to take notes, the speech is believed to have been an impassioned condemnation of slavery.

Abraham Lincoln was an American lawyer, politician, and statesman, who served as the 16th president of the United States, from 1861 until his assassination in 1865. Lincoln led the United States through the American Civil War, defending the nation as a constitutional union, defeating the insurgent Confederacy, playing a major role in the abolition of slavery, expanding the power of the federal government, and modernizing the U.S. economy.