This article contributes to the debate on illicit antiquities and deterrence. First, I briefly examine what has been written about deterrence in the literature on illicit antiquities. Second, I review the criminological research literature on deterrence to define the concept and explain its mechanics; that is, how, according to the best state of current knowledge, deterrence “works” to persuade people not to commit crime. Third, I consider what this criminological knowledge base means for deterrence in the field of illicit antiquities. Deterrence remains a developing idea, rich with practical implications for crime prevention but also harboring some profound unresolved questions about precisely what drives human action in certain contexts. Nonetheless, we can aim to gain a more rounded understanding of the concept than has previously been applied to illicit antiquities studies.