Unitarian Universalist Church of Arlington (UUCA), historically known as the Unitarian Church of Arlington, is a Unitarian Universalist church located at 4444 Arlington Boulevard in Arlington County, Virginia. Founded in 1948, UUCA was the first Unitarian church in Washington, D.C.'s suburbs. Throughout its history, UUCA has taken part in progressive causes from the Civil Rights Movement to the legalization of same-sex marriage in Virginia.