In recent years, the term sectarianism has been widely used to explain contemporary affairs across the Middle East and North Africa. A range of assumptions about the nature of sectarianism have become prevalent amongst scholars and policy makers who engage with these areas, in part driven by the rivalry between Saudi Arabia and Iran (the two dominant Sunni and Shi'a states) and the emergence of ISIS. Despite its prevalence, few scholars have engaged critically with the meaning of the term and its application across the Middle East. Whilst many associate sectarianism with Islam,...