This third volume in the new series of supplements to the Journal of Semitic Studies is a survey of the historical and religious problems involved in the interconnection between the Sabians of the Qur'an, the Mandeans of southern Iraq, and the "Sabians" of Harran in northern Mesopotamia. It offers an important examination of traditional assertions by some that the Mandaeans and by others that the Harranians should be recognized as the "Sabians" of the Qur'an, the people granted protected status in Islamic law.