Abstract: Background: The study was conducted to compare the effects of tubal sterilization through electrocoagulation and the application of mechanical clips on the ovarian reserve. Study Design: Eighty-eight patients in the reproductive period with the desire of tubal sterilization were included in the prospective, randomized study. The patients were divided into two groups by simple randomization as tubal sterilization through electrocoagulation group and the application of mechanical clips group. Day-3 serum follicle stimulating hormone, luteinizing hormone, estradiol, inhibin-B and antimüllerian hormone and Day-3 total ovarian volume measurements and anthral follicle counts of all patients in the preoperative and 10th postoperative months were compared both within and between the two groups. Results: A significant difference between the postoperative 10th-month Day-3 total ovarian volumes and anthral follicle counts was detected between the electrocoagulation and mechanical clips application groups. Conclusion: Tubal sterilization by electrocoagulation is very likely to have an adverse effect on the ovarian reserve in the postoperative period. [Copyright &y& Elsevier]