Timothy P. O'Malley is a Catholic theologian, author, speaker, and the director of McGrath Theology Online at the McGrath Institute for Church Life at the University of Notre Dame. He also teaches on marriage and family, sacramental theology, and catechesis in the Department of Theology at Notre Dame.

O'Malley earned his bachelor's degree in theology and philosophy and his master's degree in liturgical studies from Notre Dame. He earned a doctorate in theology and education at Boston College.

He is the author of several books, including the award-winning Off the Hook, Divine Blessing: Liturgical Formation in the RCIA, Bored Again Catholic, and Liturgy and the New Evangelization. His articles have appeared in publications such as America magazine, Religion News Service, Aleteia, Catechist, and Our Sunday Visitor Newsweekly.

He lives with his family in the South Bend, Indiana area.

The McGrath Institute for Church Life was founded as the Center for Pastoral and Social Ministry by the late Notre Dame President Fr. Theodore Hesburgh, C.S.C., in 1976. The McGrath Institute partners with Catholic dioceses, parishes, and schools to provide theological education and formation to address pressing pastoral problems. The Institute connects the Catholic intellectual life to the life of the Church to form faithful Catholic leaders for service to the Church and the world. The McGrath Institute strives to be the preeminent source of creative Catholic content and programming for the new evangelization.