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Crizotinib is an orally available tyrosine kinase inhibitor for patients with anaplastic lymphoma kinase-positive non-small cell lung cancer (NSCLC). Despite that crizotinib-induced hepatotoxicity may cause a dose reduction or interruption that can affect the patient’s treatment, there is no study to investigate factors for crizotinib-induced hepatotoxicity. The purpose of this study was to evaluate factors affecting crizotinib-induced hepatotoxicity. From February 2012 to April 2018, a retrospective study was performed on NSCLC patients treated with crizotinib. Various factors were reviewed including sex, age, body weight, height, body surface area, underlying disease, smoking history, genetic mutation, and concomitant drugs. Among 153 patients, incidence of crizotinib-induced hepatotoxicity of grade I or higher was 83% (n = 127). The presence of liver disease or HBV revealed significant effect on hepatotoxicity …