Theological Action Research (TAR) is a way of doing and teaching theology and forming students that surmounts the problems associated with both formal theologies and theological ethnographies. Drawing from models of action research developed in other fields, this paper outlines an approach to teaching practical ministry grounded in a collaborative mode of inquiry capable of generating new insights into humanity's relation to God while also engendering the ethical-political powers that give shape to collective life. As a process of what anthropologist Lia Haro calls eth-o-graphy, Christian formation and knowledge production cannot be disconnected from cooperative participation in communities of practice dedicated to this kind of social, ecclesial activity. The paper goes on to describe how the author has begun to implement this TAR model at a Catholic, Jesuit institution, offering some promising preliminary findings on the potential it holds for training ministry students.