The relevance of the study is due to the need to form practical skills in decision-making and determine the main determinants of the ability to quickly adapt to rapid changes, generate rational ideas and make logical decisions in the professional activity of law enforcement officers. The purpose of the article is to expand the concept, analyze and empirically investigate the importance of the phenomenon of tolerance to ambiguity in the system of decision-making in the professional activity of law enforcement officers. The methodology of problem analysis was formed by the general theory of tolerance to ambiguity, which is based on both differentiation and integration of existing knowledge in various fields. Research results. An analysis of decision-making and overcoming uncertainty, unstructuredness, which manifests itself in life and professional situations, is carried out. The role of rigidity in the system of intolerance is substantiated and the role of this concept in the process of learning metacognitive skills is defined. The phenomenon of tolerance to ambiguity and the importance of lability and flexibility in the decision-making system are described. The concept of tolerance depends on the perspectives related to the cultural context and is formed on them, indicates how individuals relate to the near or distant future, and has the properties of emergency, which will play a special role in the practical processing of new conditions in which law enforcement officers are forced to act , migration and cross-cultural changes occurring within the country and a high load of social interaction. The extent to which these factors are important for building a new adaptation scenario for representatives of specific types of activity has been analyzed and empirically investigated. Badner's uncertainty tolerance questionnaire was tested and presented. The scientific novelty of the article consists in the systematization and generalization of psychological approaches in the general structure of decision-making through ambiguity tolerance, which actively participates in dynamic processes related to overcoming or generating uncertainty (primarily at the cognitive level) by changing existing ideas and concepts, and also by creating new ones. The practical significance is presented in the elaboration of the model of the phenomenon of tolerance to ambiguity, which allows differentiation of individuals-law enforcement officers with their ability to accept uncertainty; disclosure of coping mechanisms; description of possible means of developing tolerance to ambiguity and research and expansion of previous work in the field of decision-making and the role of the factor of tolerance to ambiguity in the specific conditions of the professional activity of law enforcement officers and the importance of developing this feature in the decision-making system.