People are often responsible for what they do, but they also often possess an excuse. One of the most common excuses is ignorance. Not all ignorance constitutes an excuse, however, for some ignorance is culpable and culpable ignorance is no excuse. But what about group agents? In our everyday practices, we blame group agents constantly. But if groups can be blameworthy, they plausibly can also be excused. Surely one such excuse is ignorance. But, as with individual agents, some group ignorance (...) is also surely culpable. How should we understand the culpable ignorance of group agents? In this paper, I argue for two conditional claims that together constitute what I call the Group Justification Thesis, which is a group-agent adaptation of the Justification Thesis put forth by Biebel [(2018). ‘Epistemic Justification and the Ignorance Excuse.’ Philosophical Studies 175 (12): 3005–3028]: (i) A group agent is excused because of ignorance only if that ignorance is justified, and (ii) a group agent is culpable despite being ignorant only if that ignorance is not justified. One interesting upshot of this view is that a group agent can be culpably ignorant even though none of the members are culpable for their ignorance. (shrink)