Humility is an integral virtue within Benedictine spiritual traditions. It is also the subject of a burgeoning body of empirical literature in the field of psychology. This dissertation undertakes an interdisciplinary dialogue between Benedictine spirituality and contemporary psychological science, exploring the potential for both fields to mutually inform as well as critique respective understandings of humility. Scholarship in Benedictine spirituality has not shown substantial engagement with the field of psychology around the topic of humility since the 1980’s. Likewise, no in-depth analysis of the Benedictine spirituality of humility has been conducted within psychology, despite increasing interest in interdisciplinary projects among psychologists of spirituality and religion. In the body of this dissertation, chapter one sets out to locate this project within the disciplines of practical theology, spirituality studies, and the psychology of religion and spirituality. It also describes the methods used in this dissertation, with particular focus on the dynamics of mutually critical correlation, a method that gives room for both fields to inform, critique, and question the other around their positions regarding the theory and practice of humility. Chapter two presents an in-depth exploration of Benedictine humility, focusing in particular on themes in the Rule of St. Benedict as well as different contemporary interpretations of humility that have emerged over the last thirty years. Chapter three then offers an exploration of the contemporary state of the psychology of humility, documenting the growing body of research on this subject over the last two decades. Chapter four moves into the interdisciplinary analysis of this dissertation, inquiring how contemporary psychological research on humility could potentially inform Benedictine spirituality. Chapter five then switches to consider how insights and perspectives on humility from Benedictine traditions can also inform theoretical perspectives on humility within psychology, as well as applications in psychological interventions that integrate spirituality. Finally, a concluding chapter highlights some points of learning regarding interdisciplinary research on humility in spirituality and psychology, along with questions for future research and a final selection of key points for practice in both fields.