The schizoid personality disorder is characterized by a lack of interest in close relationships, both in the family and in other interpersonal relationships, including intimate/sexual interactions, a superiority of introverted activities, emotional coldness, estrangement and flattened affect (DSM-5). This video lecture is devoted to the review of the prevalence, diagnosis, and treatment of this disorder. In addition, the lecture examines clinical cases and an example of managing such patients.