Unitarian Universalist Association, religious organization in the United States formed in May 1961 by merger of the Universalist Church of America and the American Unitarian Association. The American Unitarian Association was founded in 1825 as the result of a gradual development of Unitarianism (the denial of the Trinity) within New England Congregationalism in the late 18th and early 19th centuries. The Universalist Church of America developed from an 18th-century movement in the eastern United States among those who believed in universal salvation. The first Universalist Church was formed in 1779, and in 1790 the Universalists adopted a doctrinal statement and plan for church government at a convention in Philadelphia.
The Unitarian Universalist Association has no creed, and individual congregations vary widely in their worship service, religious beliefs, and religious practices. National headquarters, in Boston, Mass., consist of departments dealing with the ministry, extension, religious education, adult education, world service, world churches, and publications. District organizations cover the continental area, with boards and executives responsible to district churches and fellowships. The General Assembly of delegates from churches and fellowships meets annually.