This study develops and validates a measure for assessing Middle East Muslims’ level of ethnodoxy. Ethnodoxy is an “ideology that rigidly links a group’s ethnic identity to its dominant faith” (Karpov et al. 2012). At an individual level, it is the individuals’ subjective assessment of co-extensiveness of his religious group and his ethnic identity. It presents a set of survey questions that can form a scale for measuring ethnodoxy in the Arab Middle East by drawing on literature on ethnodoxy among Russian Orthodox and Armenian Orthodox populations (Karpov et al. 2012; Avetyan 2017; Barry 2019). It uses factor analysis, convergent validity, and divergent validity. This scale evaluates the connection a person has forged between being Arab and being a Muslim. It also explores the connection between ethnodoxy and political attitudes (e.g., gender traditionalism and immigration preferences).