The Liberty Party was an abolitionist political party in the United States prior to the American Civil War. The party experienced its greatest activity during the 1840s, while remnants persisted as late as 1860. It supported James G. Birney in the presidential elections of 1840 and 1844. Others who attained prominence as leaders of the Liberty Party included Gerrit Smith, Salmon P. Chase, Henry Highland Garnet, Henry Bibb, and William Goodell. They attempted to work within the federal system created by the United States Constitution to diminish the political influence of the Slave Power and advance the cause of universal emancipation and an integrated, egalitarian society.

In the United States, abolitionism, the movement that sought to end slavery in the country, was active from the colonial era until the American Civil War, the end of which brought about the abolition of American slavery, except as punishment for a crime, through the Thirteenth Amendment to the United States Constitution.