Introduction: Tonsillectomy is considered one of the most common otorhinolaryngological procedures, and it refers to the removal of tonsils located in the throat (one on each side of the throat). Tonsillectomy can be performed with or without adenoidectomy - removal of the third tonsil, more precisely the adenoid tissue located in the back of the nose. The aim of this research was to gain insight into the most common surgical procedure on the tonsils, the age group in which tonsil operations are most often performed, the most common postoperative complications and the reasons for rehospitalization. Materials and methods: Data from the database of the hospital information system (BIS) on surgical procedures on the tonsils at the Department of Otorhinolaryngology at the Karlovac General Hospital. Respondents in this research are all children operated on between January 1, 2017 and December 31, 2022, aged 3 to 18 years. Results: Children who belong to the younger age group (3-10 years) are more often subjected to surgical procedures on the tonsils compared to the older age group (11-18 years). The number of readmissions due to postoperative complications is 18 (1.70%), with the only postoperative complication being bleeding. Boys are more likely to undergo tonsil operations. The number of readmissions due to postoperative complications is 18, and the only postoperative complication is bleeding. Conclusion: Adenotonsillectomy is the most common surgical procedure in children aged 3 to 18 years, and younger children are more often subjected to tonsil surgery in OB Karlovac. In future research, it is necessary to include a larger number of general hospitals in the Republic of Croatia, to collect data on the reasons for undergoing tonsil operations in children, to collect data on the operations undergone by rehospitalized children, and to include children under the age of three. In this way, postoperative complications and the reasons for readmission of children would be determined and analyzed in more detail in order to provide better care for children and provide education to parents about tonsil operations and postoperative complications.