This article provides a detailed exposition of the missional features of Dietrich Bonhoeffer’s ecclesiology. Three major insights are explored. First, the Church engages in mission by proclaiming and embodying the gospel. Secondly, the Church accomplishes its mission by faith, not by “religion.” Thirdly, the Church pursues its mission by existing-for-others in a life of costly discipleship and responsible action in the midst of the world.