The work is based on a comparative analysis of the results of various laparoscopic bariatric surgery performed in 123 patients with morbid obesity. The authors modified and tested a variant of laparoscopic longitudinal stomach resection. Based on a comparative evaluation of the effectiveness of a typical laparoscopic longitudinal stomach resection and its modified variant and laparoscopic gastric bypass surgery, the authors showed that the modified version of the laparoscopic longitudinal stomach resection also contributes to more intense weight loss and effective correction of type 2 diabetes mellitus and does not negatively affect vitamin mineral deficiency. The purpose of the study. Comparative evaluation of the effectiveness of various laparoscopic bariatric surgery and a modified technique for laparoscopic longitudinal stomach resection in patients with morbid obesity. Materials and methods. The work is based on an analysis of the results of various laparoscopic bariatric surgery performed between 2012 and 2017 at the surgical clinics of the Modern Hospital and the Azerbaijan Medical University in 123 patients aged 16 to 60 years with various degrees of MO. There were 95 women (77.2%), 28 men (22.8%). The body mass index averaged 57.5±12 kg/m2. Depending on the technical options and the metabolic effect of the performed bariatric operations, the patients were divided into 3 groups. Group 1 included 57 (46.3%) of 123 patients who underwent standard laparoscopic longitudinal stomach resection (LLSR). Group 2 included 52 (42.3%) patients who underwent modified laparoscopic longitudinal stomach resection (MLLSR). Group 3 included 14 (11.4%) patients who underwent laparoscopic Roux-en-Y gastric bypass (LGB). Results. A comparative analysis of the results of LLSR, MLLSR and LGB demonstrates that MLLSR provides more intense weight loss and effective correction of concomitant type 2 diabetes mellitus. An effective weight loss and positive dynamics in the correction of type 2 diabetes mellitus, as well as the absence of a negative effect on vitamin and mineral metabolism, indicate the indisputable advantage of MLLSR. Conclusion. The technical simplicity of the method, a more intensive decrease weight loss after surgery, as well as the possibility of effective correction of type 2 diabetes mellitus suggest that MLLSR can be used in the surgery of MO and type 2 diabetes mellitus. However, according to the efficiency of correction of type 2 diabetes mellitus, this method is inferior to LGB. In order to obtain reliable data and determine the place of MLLSR in bariatric surgery, further accumulation of experience and a scientific analysis of the results are necessary.