Background/Aims: To determine the long-term efficacy of laparoscopic or robotic adenomyomectomy with or without gonadotropin-releasing hormone (GnRH) for the treatment of severely symptomatic adenomyosis. Methods: Between August 2008 and May 2011, we prospectively observed 33 patients who underwent laparoscopic or robotic adenomyomectomy with uterine artery ligation for the treatment of symptomatic adenomyosis. Seventeen patients (52%) received 3-course GnRH agonist treatment after the adenomyomectomy. Results: The mean operating time was 147.4 ± 52.0 min, and the mean blood loss was 36.1 ± 37.4 ml. Postoperative complications occurred in 5 patients, including 4 cases of febrile morbidity, 1 case of ileus and 1 case of pelvic abscess. Patients had statistically significant symptom relief during the 3-year follow-up period. Four of the 33 patients (12%) showed symptom relapse; 3 patients showed a relapse with dysmenorrhea and 1 patient showed a relapse with menorrhagia. There were no significant differences in terms of therapeutic outcomes between surgical-only and surgical-medical treatment. Conclusion: Laparoscopic or robotic adenomyomectomy was feasible and safe for women with severely symptomatic adenomyosis who requested uterine preservation. Moreover, this procedure provided long-term symptom control, regardless of postoperative GnRH agonist administration.