Abstract Background Gastro-cutaneous fistula is a rare complication after laparoscopic sleeve gastrectomy (LSG) with incidence of occurrence 1–2%. Most of gastro-cutaneous fistulae do not respond to conservative management and need intervention either surgically or endoscopically. Methods This prospective randomized clinical study included referred patients who had LSG performed at our department or other centers, and complicated with post-LSG leak or gastro-cutaneous fistula between December/2019 and March/2021. Included patients were ASA Physical status I–II. Primary and secondary outcomes were recurrence of the fistula and mortality in each group after the intervention during the 18 months follow-up period, respectively. Results Thirty patients were randomized into two groups: Surgery Group (SG, n = 15) and Endoscopy Group (EG, n = 15). Mean age of patients was 42.3 ± 8.7 and 42.6 ± 8.3 years-old in SG and EG, respectively. Females constituted 73.3% and 80% in SG and EG, respectively. Median time-to-gastric leak post LSG was six (range: 4–7) days in both groups. SG patients were surgically managed with primary repair of the gastric fistula and gastrojejunostomy in 13 patients or converting SG into Roux-en-Y gastric bypass in two patients, while EG patients were endoscopically managed with stitching, stenting, stenting and dilation, and clipping and dilation in 5, 4, 4 and 2 patients, respectively. Incidence of recurrent leak during 1st week was significantly higher in SG than EG (p < 0.001). No mortality reported in EG, while 2 patients died in SG (p = 0.48). Conclusion Endoscopic intervention may offer a successful modality in managing post-LSG gastric leak and gastro-cutaneous fistula that do not respond to conservative measures in stable patients.