This bachelor's thesis deals with the connection between parenting styles, attachment and drug addiction in adolescents. The literature review section is devoted to the description of individual phenomena. It then presents relevant research that can outline the relationships between them. The theoretical part is followed by a mixed methods research proposal, the aim of which is to examine the relationships between phenomena on a sample of adolescents. Quantitative data are supplemented by case studies for the purpose of better introduction to the issue. Keywords Parenting Styles; Attachment; Addictive Substances; Addiction; Adolescenc