Protopresbyter Fr. Nikolaos Loudovikos (Greek: Π. Νικόλαος Λουδοβίκος) is a Greek theologian, priest, psychologist, author and professor.

Dr. Fr. Nikolaos Loudovikos was born in Volos, Greece in 1959. He studied Psychology and Education at the University of Athens, Theology at the University of Thessaloniki, Philosophy at the University of Sorbonne in Paris, Philosophy and Roman Catholic Theology at the Catholic Institute of Paris, Philosophy and Protestant Theology at the University of Cambridge (England). He holds a Ph.D from the Department of Pastoral Theology of the University of Thessaloniki in 1989. The title of his dissertation was "Eucharistic Ontology in the Theological Thought of St. Maximus the Confessor".

He has worked as a researcher at the Tyndale House (Cambridge) and has taught and lectured at the Centre for Advanced Religious and Theological Studies (CARTS) of the Department of Theology at the University of Cambridge, at Durham University, as well as at other Universities and Research Centers. Today he is the Chair of the Department of Theology and Pastoral Studies and a Professor of Dogmatics and Philosophy at the University Ecclesiastical Academy of Thessaloniki, Author for the postgraduate program of Theology at the Hellenic Open University in Patras, Greece, Visiting Professor at the Institute for Orthodox Christian Studies at the University of Cambridge, and an Honorary Research Fellow at the University of Winchester, U.K.

Fr. Nikolaos Loudovikos is member and co-secretary (Orthodox) of the Saint Irenaeus Joint Orthodox-Catholic Working Group.