The expansion of international human rights institutions has drawn much attention. Bringing together theories from sociology, political science, and international law, this article examines what factors promote public support for international human rights institutions, using the recent wave of the World Values Survey data (2005–2008). The level of public support displays both cross‐national and cross‐individual variations, so I conceptualize it as a two‐level process and employ the multilevel modeling. At the individual level, it is found that men, younger people, and individuals with more education and income show a higher level of support. At the country level, national affluence, political change (de‐democratization), and linkage to the world society are associated with more support. I further integrate individual‐level characteristics and country‐level social contexts, and pay special attention to education. Education is the institutional link between macro‐level social influences and micro‐level individual attitudes. I find that the support‐promoting effect of education is contingent on social contexts. It is more salient in wealthy countries and countries with strong ties to the world society.