Abstract In international politics, governments may tend to favor countries with which they share some degree of cultural affinity. Moreover, international organizations can strengthen solidarity among their members. Not surprisingly, Muslim countries, which came together under the umbrella of the Organization of Islamic Cooperation (OIC), frequently state that they pursue Muslim solidarity in international politics. By looking at voting preferences of OIC member Muslim countries in the UN General Assembly about the selection of nonpermanent UN Security Council members, this article aims to understand Muslim solidarity in international politics. For this, the article uses newspaper reports, political statements, secret intelligence reports, and interviews regarding the votes of Muslim countries in contested elections in which a Muslim country competed with its non-Muslim rival for the same Security Council seat.