Thomas D. Williams, LC, ThD, is a Catholic priest and professor of theology and ethics.

Father Williams holds degrees in theology, philosophy and business administration, as well as a diploma in languages and classical humanities. He teaches theology at the Regina Apostolorum Pontifical Athenaeum in Rome, is senior fellow of the Saint Paul Center for Biblical Theology, and a member of the Pontifical Academy of Saint Thomas Aquinas.

Since 2004 he has served as Vatican Analyst and consultant on faith, ethics and religion for several television networks, including NBC and CBS, covering papal trips and Church affairs, and offering commentary and analysis of ethical issues in the news.

Williams has published 13 books and more than 100 articles on a broad variety of topics, and gives numerous lectures and speeches on subjects that range from Christian spirituality to media ethics to the new atheism.

Father Williams has been a member of the religious congregation of the Legionaries of Christ since 1985, and was ordained a priest in 1994.