Objectives: This study aimed to investigate practice patterns for the management of LS-associated endometrial cancer among Korean gynecologic oncologists. Material and methods: Members of the Korean Society of Gynecologic Oncology were surveyed using a self-administered questionnaire regarding their knowledge and clinical management of LS by paper or e-mail. Results: Of the 49 participants, the median age was 43 years (range, 30–75). The respondents worked mainly in Seoul (25/49, 51.0%) and the capital area (16/49, 32.7%). The average score on LS knowledge assessment was 3.8 (range, 0–8) with a maximum score of 8. The following tools were used by the respondents for the identification of inherited endometrial cancer: obtaining of family history (46.7%), immunohistochemistry (IHC) test for four mismatch repair (MMR) genes (38.8%), and microsatellite instability (MSI) test (8.2%) for all endometrial cancer patients. The indications for recommending the germline MMR gene test were endometrial cancer with a family history (5/49, 10.2%), patients who met the Amsterdam II criteria (32/49, 65.3%), abnormal IHC test results (13/49, 26.5%), and abnormal MSI test results (8/49, 16.3%). Approximately half of the respondents recommended cascade testing (28/49, 57.1%) to the family of the proband and recommended risk-reducing management for MMR mutation carriers (27/49, 55.1%). Conclusion: Gynecologic oncologists in Korea are not aware of genetic risk assessment and patient counseling about LS. Therefore, it is necessary to educate physicians and develop guidelines in this regard.