Rev. Joshua Leavitt (September 8, 1794, Heath, Massachusetts – January 16, 1873, Brooklyn, New York) was an American Congregationalist minister and former lawyer who became a prominent writer, editor and publisher of abolitionist literature. He was also a spokesman for the Liberty Party and a prominent campaigner for cheap postage. Leavitt served as editor of The Emancipator, The New York Independent, The New York Evangelist, and other periodicals. He was the first secretary of the American Temperance Society and co-founder of the New York City Anti-Slavery Society.
Born in Heath, Massachusetts, in the Berkshires, Leavitt attended Yale College, where he graduated at age twenty. He subsequently studied law and practiced for a time in Putney, Vermont, before matriculating at the Yale Theological Seminary for a three-year course of study. He was subsequently ordained as a Congregational clergyman at Stratford, Connecticut. After four years in Stratford, Rev. Leavitt decamped for New York City, where he first became secretary of the American Seamens' Friend Society, and began his 44-year career as editor of Sailors' Magazine. Thus was Leavitt launched on his career as social reformer, temperance spokesman, editor, abolitionist and religious proselytizer.
Leavitt was heavily involved in a series of high-profile anti-slavery cases, including the escape of the slave Basil Dorsey from Maryland into Massachusetts (Leavitt aided Dorsey's passage northward, and members of the extended Leavitt family helped shelter Dorsey in Massachusetts), as well as the La Amistad case, in which enslaved Africans on a Spanish ship rebelled and took control. Leavitt played a pivotal role in the Amistad events, when on September 4, 1839, he and Lewis Tappan and Simeon Jocelyn formed the Amistad Committee to raise funds for the defense of the Amistad captives.