A Unitarian is a follower of, or a member of an organisation that follows, any of several theologies referred to as Unitarianism:
Unitarianism (1565–present), a liberal Christian theological movement known for its belief in the unitary nature of God, and for its rejection of the doctrines of the Trinity, original sin, predestination, and of biblical inerrancy
Unitarian Universalism (often referring to themselves as "UUs" or "Unitarians"), a primarily North American liberal pluralistic religious movement that grew out of Unitarianism
Canadian Unitarian Council, an institution that joined the Unitarian Universalist Association in 1961 and left by agreement in 2002 to provide almost all equivalent services for Unitarian Universalists in Canada
Biblical Unitarianism, a scripture-fundamentalist non-Trinitarian movement (flourished c.1876-1929)
Nontrinitarianism, a generic name for a Christian point of view that rejects the Trinity doctrine
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