Abstract: Laparoscopic sleeve gastrectomy is a very common operation done on obese patients who hope to reduce their weight and cure metabolic syndrome illnesses such as diabetes mellitus type 2 and dyslipidemia. This technique is being widely used for treatment of diabetes. The effectiveness of laparoscopic sleeve gastrectomy in curing diabetes mellitus was studied on Arab population. We assessed 400 obese patients who underwent laprascopic sleeve gastrectomy from 2011 to 2017 in King Fahd General Hospital in Jeddah, KSA. Out of the 400 patients 93 had diabetes mellitus type 2, which were included in this study. All patients showed an improvement in their body weight, body mass index and fasting blood glucose, however a few patients still showed elevated blood glucose levels after their operations. Based on our results we can conclude that laparascopic sleeve gastrectomy was effective in improving the conditions associated with diabetes mellitus type 2 among local population.