Brian Flanagan is a Catholic theologian whose research specializes in ecclesiology. He is Senior Fellow at New Ways Ministry, a nonprofit working for education and advocacy on LGBTQ+ issues in the Catholic Church, and Research Fellow at the Berkley Center for Religion, Peace, and World Affairs at Georgetown University. He is the author of Stumbling in Holiness: Sin and Sanctity in the Church, and a former President of the College Theology Society.