Among the most important modern Catholic thinkers, Joseph Ratzinger, later Pope Benedict XVI, fundamentally shaped Christian theology in the 20th and early 21st centuries. His collaborations and debates with figures such as Henri de Lubac, Karl Rahner, Jean Daniélou, Hans Küng, Hans Urs von Balthasar, and Jürgen Habermas reflect the key role he has played in the development of Christian life and doctrine. The Cambridge Companion to Joseph Ratzinger conveys the depth and breadth of his significant legacy to contemporary Catholic theology and culture. With contributions from an international team of scholars, the volume assesses Ratzinger's theological synthesis in response to contemporary challenges that Christianity faces. It surveys the major themes and topics that Ratzinger explored, and highlights aspects of the ideas that he developed in his engagement with a wide variety of intellectual and religious currents. Collectively, the essays in this volume demonstrate how Ratzinger's epochal contributions to Christian thought will reverberate for generations to come. ‘A highly useful introduction to his ideas and writings on numerous theological subjects, The Companion is recommended for seminary libraries.’ Hans C. Rasmussen, Catholic Library World ‘Cardó and Lang’s Cambridge Companion is truly a gift … an outstanding volume.’ Joshua Penduck, The Global Anglican A study of key themes in Ratzinger's thought, highlighting his theological synthesis in response to religious and intellectual challenges. Daniel Cardó holds the Benedict XVI Chair of Liturgical Studies at Saint John Vianney Theological Seminary in Denver. He is the author of The Cross and the Eucharist in Early Christianity (2019), What Does it Mean to Believe? Faith in the Thought of Joseph Ratzinger (2020), and The Art of Preaching (2021). Uwe Michael Lang is an adjunct faculty member at the Institute of Theology and Liberal Arts at St Mary's University, Twickenham and Allen Hall Seminary. A priest of the Oratory of St Philip Neri in London, he is the author of The Roman Mass: From Early Christian Origins to Tridentine Reform (2022).