Recent scholarship in a number of disciplines has explored the relationship between ontology and ethics. The essays in this collection indicate what the German theologian Dietrich Bonhoeffer (1906-1945) has to contribute to this discussion. By engaging the breadth of his academic and pastoral writings, these essays retrieve Bonhoeffer’s theology for a contemporary audience. They do so by critically clarifying and extending key concepts developed by Bonhoeffer across his corpus and in dialogue with Hegel, Heidegger, Dilthey, Barth, and others. They also create dialogues between Bonhoeffer and more recent figures like Levinas, Agamben, Foucault, and Lacoste. Finally, they take up pressing, contemporary ethical issues such as globalization, managerialism, and racism.