We give the definition of the essence of the formation of teenager’s legal culture, which is understood as a purposeful, specially organized, managed social and pedagogical process that provides the assimilation of legal knowledge by teenagers, the manifestation of the legal position in socially useful activities. We also consider the impact factors of formation of legal culture of a modern teenager in society. The leading factors affecting teenager’s legal culture include a single national policy in the field of legal culture (“Fundamentals of State Policy of the Russian Federation in the Field of Legal Literacy and Legal Awareness of Citizens”), the organization of space for the participation of teenagers in socially significant activities and for the implementation of legal education (for example, the program “Do not Stumble!”), socializing the potential of the family in the process of legal education, the impact on the legal culture of the teenager media, first of all, Internet (methodical recommendations about placement on information stands, official Internet sites and other information resources of the educational organizations and bodies exercising management in the sphere of education, information on safe behavior and use of the Internet), legal education of teenagers in educational institution, attraction of the new subjects influencing formation of legal culture (interdepartmental interaction) (it is considered on the example of activity of the Children’s rights ombudsman and legal clinics), influence of features of teenage age.