Bahrain–Iran relations are the bilateral relations between the countries of Bahrain and Iran. Since the 1979 Iranian Revolution, relations between the two countries have been strained over various geopolitical issues such as the interpretations of Islam, aspirations for leadership of the Islamic world, and relations with the United States, Europe, and other Western countries. In addition, Iran has been severely critical of Bahrain for hosting the United States Fifth Fleet within the Persian Gulf at the Naval Support Activity Bahrain base.