Unitarian Universalist Association (UUA) is a liberal religious association of Unitarian Universalist congregations. It was formed in 1961 by the consolidation of the American Unitarian Association and the Universalist Church of America Christian denominations with Unitarian and Universalist doctrines, respectively. However, modern Unitarian Universalists see themselves as a separate religion with its own beliefs and affinities. They define themselves as non-creedal, and draw wisdom from various religions and philosophies, including humanism, pantheism, Christianity, Hinduism, Buddhism, Taoism, Judaism, Islam, and Earth-centered spirituality. Thus, the UUA is a syncretistic religious group with liberal leanings.

Unitarian Universalism is a liberal religious movement characterized by a "free and responsible search for truth and meaning". Unitarian Universalists assert no creed, but instead are unified by their shared search for spiritual growth. Unitarian Universalists do not have an official, unified corpus of sacred texts but rather draw inspiration and guidance from the six sources: personal experience, prophetic utterances, world religions, Jewish and Christian teachings, humanist teachings, and spiritual teachings. Unitarian Universalist congregations include many atheists, agnostics, deists, and theists; there are churches, fellowships, congregations, and societies around the world.