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

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

He is known for his television appearances as Vatican analyst and consultant on faith, ethics and religion, previously for NBC, and currently for CBS News.

He writes on topics both accessible and erudite via numerous books, scholarly essays, and popular articles. He also gives many lectures and speeches.

Fr. Williams teaches at the Regina Apostolorum Pontifical Atheneum, a university run by the Legionaries of Christ, the religious congregation of which he is a member since 1985.  He resides in Rome, Italy.