We provide novel data on value diversity. * Our data capture the extent to which key human values are shared within societies. * We find that value diversity has a significant negative effect on trust formation. * The effect is robust to controlling for other dimensions of social diversity. * The effect is present at different levels of aggregation. Social diversity has been linked to a range of socio-economic and political outcomes, generally showing that higher diversity is associated with lower socio-economic performance. In this paper we focus on the extent to which key human values and beliefs are shared in society, which captures a dimension of diversity not previously discussed. We assess the importance of value diversity by focusing on its role in fostering generalized trust within societies. We find that value diversity, in particular with regard to political ideological values concerning income redistribution and the role of the government in influencing markets, is important for understanding the international variation in trust, with high diversity being associated with lower levels of trust. This relationship is robust to controlling for various other determinants of trust, including other dimensions of diversity, and holds at various levels of aggregation.