To evaluate safety and effectiveness of the combination of hysteroscopic endometrial focal resection with levonorgestrel-releasing intrauterine device (LNG-IUD) for International Federation of Gynecology and Obstetrics stage IA G1 early endometrial cancer (EEC) and atypical endometrial hyperplasia (AEH) in young women to preserve their fertility. Retrospective case series (Canadian Task Force classification II-3). University Federico II, Naples, Italy. The medical records of 69 consecutive patients treated from 2007 to 2017 with diagnosis of EEC (n = 14) or AEH (n = 55) meeting inclusion criteria were reviewed. Patients with focal EEC were treated by hysteroscopic resection of the lesion according to Mazzon's technique; patients with AEH were treated by superficial endometrial resection, preserving the basal layer of the endometrium. An LNG-IUD was inserted in all patients after surgery. Patients were followed for 24 months with serial hysteroscopic biopsies. Rates of response, live birth, and recurrence were assessed. Of the 14 patients with EEC, 11 (78.6%) achieved a complete response, 2 (18.2%) of whom had subsequent relapse, 1 (7.1%) showed partial response, whereas 2 (14.3%) were nonresponders (1 stable disease and 1 progression). Of the 55 patients with AEH, 51 (92.7%) achieved a complete response, 2 (3.9%) of whom had subsequent relapse, 3 (5.5%) showed partial response, whereas only 1 (1.8%) was nonresponder with stable disease. Among 25 patients who had removed the LNG-IUD, 10 (40%) gave birth after natural conception in the last 12 months of follow-up. The combination of hysteroscopic resection with an LNG-IUD as fertility-sparing treatment of EEC and AEH showed similar response and live birth rates compared with those reported in literature for progestins alone, but with considerably lower relapse rate. We advocate the use of this combined approach as an alternative fertility-sparing option in patients with ECC and AEH.