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Patient satisfaction is a key quality indicator of gastrointestinal endoscopy (GIE). The gastrointestinal endoscopy satisfaction questionnaire (GESQ) was recently developed to assess patient satisfaction undergoing GIE in Europe; however, it was not validated in Asian countries. We aimed to translate and validate the GESQ in Korea and identify predictors for patient satisfaction during GIE.Translation of the original GESQ was performed according to accepted linguistic validation guidelines. Between March 2016 and July 2016, 350 consecutive patients were asked to complete a GESQ after GIE at Kyung Hee University Hospital. Total sum of scores was transformed from 0 to 100 by the formula: (Score-lowest possible/Score range) × 100.Exploratory and confirmatory factor analyses for construct validation reconfirmed that 4 factors were extracted from the Korean GESQ. Internal consistency reliability was acceptable with an overall Cronbach α score of 0.87. Female and nonsmoker were associated with less satisfaction with GIE (P = .021 and .006, respectively). Other factors, including age, alcohol, education or economic level, sedative endoscopy, gastroscopy with or without colonoscopy, experience of previous endoscopy, and additional examinations such as biopsy, were not associated with patient satisfaction during GIE.The Korean version of the GESQ was a valid and acceptable tool to measure satisfaction in patients who had undergone a GIE in Korea. Patient satisfaction measurement could contribute to systematic improvement of qualified GIE.