Washington Theological Union (WTU) was a Catholic graduate school of theology and seminary in Washington, D.C. in the United States, founded in 1968. It stopped accepting students in 2011, and suspended operations at the end of June 2015. WTU was accredited by the Association of Theological Schools in the United States and Canada (ATS), the Middle States Commission on Higher Education and was a member of the Washington Theological Consortium.