Abstract
I document the historically unprecedented challenges and opportunities attending the prospect of devising ecumenical ethics endorsed by both Catholics and Protestants. First, I offer several reasons for attending to the connection between ecumenism and ethics. This topic has received insufficient attention from scholars of ethics, especially given the importance and challenge of reaching a common moral witness. Second, I review previous comparisons of Catholic and Protestant approaches in ethics. Such work transitions over the twentieth century from dismissive to appreciative. Third, I show how one of the key methodological differentiators softens in recent decades as there emerges an increasing consensus on the moral sources of scripture, natural law, and history. I conclude by emphasizing the humility required for progress in the pursuit of any ecumenical ethics. The route to a common moral witness that manifests the divinely given unity of the church is continual conversion through corporate dialogue on a global scale.