James Freeman was an American Unitarian clergyman and writer, "noteworthy as the first avowed preacher of Unitarianism in the United States". After graduating Harvard and becoming pastor of King's Chapel in Boston, Freeman's revised Book of Common Prayer was adopted by the congregation. This and Freeman's later ordination are credited as the origins of Unitarianism in New England. Later receiving a D.D. from Harvard Divinity School, he was also a founding member of the Massachusetts Historical Society.

Unitarianism is a nontrinitarian branch of Christianity. Unitarian Christians affirm the unitary nature of God as the singular and unique creator of the universe, believe that Jesus Christ was inspired by God in his moral teachings and that he is the savior of humankind, but he is not equal to God himself.