Introduction: Obesity is arising health problem that is linked to many pathological conditions. Treatment of obesity has a beneficial effect on many health problems. Little data available about effect of weight loss on prediabetes.Object: To evaluate the effect of intra gastric balloon (IGB) as obesity treatment on prediabetes.Method: In a prospective study we have followed 42 obese prediabetic patients who used IGB as obesity treatment. All patients were evaluated for anthropometric measures, lipid profile, fasting blood glucose (FBG), postprandial blood glucose (PPBG) and glycosylated hemoglobin HbA1c before and 6 months after IGB insertion.Results: There was a significant reduction in body weight, waist–hip ratio and also body mass index (BMI), as by time of balloon removal mean body weight was 86.62 ± 7.84 Kg, and mean BMI at time of removal was 29.48 ± 2.31 kg/m2 compared to 99.10 ± 7.34 Kg and 33.61 ± 2.18 Kg/m2 before balloon insertion (p < 0.05). Also, significant improvement of FBG and PPBG with mean value of FBG 93.00 ± 9.12 mg% and mean level of PPBG 133.31 ± 11.68 mg% compared to FBG 110.71 ± 12.10 mg% and PPBG 166.81 ± 18.82 mg% before balloon insertion (p < 0.05), likewise there was a significant reduction in HbA1c as its mean value has become 5.48 ± 0.35 compared to 6.01 ± 0.21 before balloon insertion (p < 0.05).Conclusions: six months treatment with IGB for obesity improved the prediabetic condition that may prevent or at least delay type II diabetes mellitus, which needs longer follow-up