The UUA holds no position on the millennium, and the literal millennial eschatology of evangelical and premillennial Christianity is not part of UU theology. Classical Unitarian rationalism rejected apocalyptic literalism; classical Universalism's concern for this-worldly transformation aligned more naturally with postmillennial or progressive social idealism.

The UUA's social justice emphasis can be seen as a form of secular or liberal-religious 'kingdom building' — working through human effort, education, democratic processes, and advocacy to create a more just and peaceful world. This is not understood as a literal fulfillment of Revelation 20 but as the ongoing human responsibility to create conditions of justice and dignity for all.

To the extent that the millennial concept is meaningful in UU culture, it functions as an aspirational image — a world of peace, justice, and flourishing that motivates present action — rather than as a literal future event. The UUA's commitments to racial justice, environmental stewardship, LGBTQ+ rights, and economic equity are its version of 'millennial' hope.