To cohesively interact with others, we must recognize that we are sometimes obligated to explain our actions. In three experiments, this chapter provides evidence that young children are aware of social norms governing when explanations are owed, and judge that people are obligated to explain their actions when they directly interfere with others’ goals. In Experiment 1, 3–6-year-olds were more likely to say that agents had to explain their actions when they interfered with others’ goals, than when agents did not interfere. In Experiment 2, children differentiated between when explanations are owed and when they are desired. Finally, in Experiment 3, children showed they understand that an explanation is owed to the person whose goal was frustrated, but not to other people. These findings build on recent work in experimental philosophy on norms that govern the content of utterances, by examining norms governing when certain utterances should be said.