Theoretical issues in management ethics provide the conceptual grounds upon which practical managerial moral performance occurs. Three selected theoretical issues in management ethics today are impacting managerial moral performance and are treated: (1) the moral monism versus limited moral pluralism theories; (2) the moral cognitivism versus moral non-cognitivism theories; and (3) the moral foundations versus moral rationality theories. The explicit and implicit theoretical choices embedded in managerial moral performance are critical to understanding and improving that performance. Increased awareness of and engagement with these three theoretical issues in management ethics can lead to more responsible managerial decisions and improved moral performance.