Diversity is an important ethical concept, but it is almost exclusively studied within two domains: biodiversity and diversity of sociological attributes such as race and gender. We provide a general study of the intrinsic value of diversity. We survey prior literature on the intrinsic value of biodiversity and sociological diversity in search of insights relevant to the intrinsic value of all types of diversity. We then present three thought experiments designed to clarify intuitions about the intrinsic value of small amounts (...) of diversity, large amounts of diversity, and diversity as compared to other intrinsic values. We find that many types of diversity are intrinsically valuable at both small and large amounts, but that diversity may be a weak intrinsic value in comparison to others. Noting that diversity can be defined in many ways, we propose that, for purposes of moral evaluation, diversity should be defined to include both a diversity of individual elements within a group and a diversity of the overall patterns or structures of the group. Some of our findings about the intrinsic value of diversity are tentative, indicating that moral intuitions about diversity are sometimes ambiguous and would benefit from further study. (shrink)