AbstractAccording to an influential view by Elizabeth Harman, moral ignorance, as opposed to factual ignorance, never excuses one from blame. In defense of this view, Harman appeals to the following considerations: (i) that moral ignorance always implies a lack of good will, and (ii) that moral truth is always accessible. In this paper, I clearly distinguish these considerations, and present challenges to both. If my arguments are successful, sometimes moral ignorance excuses.