Objectives: This study aimed to identify the nature of social norms, and determine the criteria oftheir consideration from a social and legal perspective. The study also aimed to explore the impactof those norms on the formulation and modification of Islamic legal rulings.Methods: The study relied on an inductive approach via tracing the concept of social norms andcustoms, and their significance according to scholars of Islamic law and sociology. It also examineda number of Islamic legal fatwa based on social norms in traditional Islamic jurisprudential texts.Additionally, the study used an analytical approach via analyzing the views of Islamic law andsociology scholars regarding the concept of norms and its characteristics in an endeavor to establishcriteria for their consideration, and projecting those criteria to a number of contemporary legalissues.Results :The study results showed that the valid norm, as recognized by scholars of Islamic law andsociology, is based on several essential criteria. These criteria dictate that the norm should be avoluntary human action, beneficial to individuals, and characterized by general acceptance,prevalence, consistency, and widespread occurrence.Conclusion: The study recommends the necessity of muftis’ taking into account the prevailingsocial norms when issuing Islamic legal edicts or rulings. It also advocates for increasedcollaboration between Islamic law scholars and sociologists to study social phenomena and theirimpact on Islamic legal ruling.