The doctoral thesis "Criminogenic Manifestations of Football Fans and Prevention: Latvian and Foreign Experience" is a comprehensive criminological research project regarding a new social phenomenon − football fan subculture. The criminogenic manifestations of football fans are unlawful and harmful. It threatens the system of human relations in a society that ensures social peace, normal working and leisure conditions. In addition, the person's life and health, and the financial interests of natural and legal persons, may also be harmed. International sports competitions are also organised in the Republic of Latvia, therefore research into the criminogenic phenomena of football fans is topical and very needed as no similar academic research has been conducted in Latvia yet.The aim of the doctoral thesis is to develop a study, including a theoretical and practical complex on the criminological problems of the criminogenic manifestations of football fans, as well as to provide proposals for their solution.The complexity of approach and the principle of interaction are important in criminological research. Various statistics and studies have been widely used to investigate the criminogenic manifestations of football fans. The research carried out a criminological study of the socio-legal phenomena of football fan as a subject of criminological exploration: analysis of the football fan as the object of criminological research, the criminological characterization of football fans' criminogenic manifestations, as well as investigation of possible preventive measures of football fan criminogenic manifestations.The doctoral thesis is based on scientific literature and research papers, articles in criminology, criminal law, sociology and psychology. As a result of the doctoral thesis, conclusions and proposals have been made in the field of investigation of the criminogenic manifestations of football fans, as well as through the system of criminological research the improvement of sports law and sports industry regulation is proposed. The doctoral thesis consists of an introduction, three chapters divided into subchapters, and a conclusion, as well as a list of references and annexes.