Liberty Party was a political party in the United States during the mid-19th century. The party was an early abolitionist supporter. It broke away from the American Anti-Slavery Society due to grievances with William Lloyd Garrison's leadership.

The Liberty Party nominated James G. Birney for President in 1840 and 1844. The party did not attract much support. In 1848, the party met in Buffalo, New York, with other groups to form the Free Soil Party.

There was another American party called the Liberty Party in the early 1930's, founded on the economic theories of W.H. "Coin" Harvey . Harvey was its presidential candidate in 1932; he received 53,000 votes.

See also: List of political parties in the United States