This is the sixth edition of the methodological manual "Surgical Treatment of Obesity" by Yu. I. Yashkov. It presents modern bariatric and metabolic surgical procedures, as well as key conservative approaches to managing excess body weight, in a clear and accessible format. Primarily, this manual is intended for patients with overweight, obesity, and metabolic disorders (including type 2 diabetes mellitus). It helps them understand the available treatment options and make an informed decision. The book will also serve as a valuable informational reference for bariatric surgeons, residents, and practicing physicians, providing a solid foundation for patient consultations and preparation for surgical weight-loss treatment.