The study was carried out to determine the disciplinary problems students experienced on returning to school after the pandemic. This is a case study, one of the qualitative research designs conducted with five principals working in high schools in Turkey, who volunteered to participate in the research in the first semester of the 2021-2022 academic year. Principals were selected according to the snowball sampling method. In the research, disciplinary problems were handled as personal, against friends, and disorganizing problems. When the reasons for disciplinary problems are examined, they are psychological, technological, social-emotional, familial, academic, and school orders. The measures by principals taken are reward-punishment and positive language and approaches.