Observe social distancing. Tip your waiter. Give priority to the elderly. Stop at the red light. Pay your taxes. Do not chew with your mouth open. These are imperatives we face every day, imposed upon us by norms that happen to be generally accepted in our environment. Call these ''socially constructed norms". A constant presence in our lives, these norms elicit mixed feelings. On the one hand, we treat them as valid standards of behaviour and respond to theirviolation with emotions such disapproval, resentment, and guilt. On the other hand, we look at them with suspicion: after all, they are arbitrary human constructs that may contribute to oppression and injustice. In light of this ambivalence, it is important to have a criterion telling us when, if ever, weare morally bound by socially constructed norms and when we should instead disregard them. Morality and Socially Constructed Norms systematically develops such a criterion. It traces the moral significance of those norms to the ag