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Objective: This study aimed to describe the current situation and explore overwork predictors among ICU nurses in China., Background: Overwork is a comprehensive condition of labor where employees work for extended periods with high intensity and high pressure, which can negatively affect their health. Limited literature exists regarding the prevalence, characteristics, professional identity, and environment of overwork among ICU nurses., Methods: A cross-sectional design study was conducted. The Professional Identification Scale for Nurses, the Practice Environment Scale of the Nursing Work Index, and the Overwork Related Fatigue Scale (ORFS) were used. To explore relationships between variables, univariate analysis or bivariate correlations were used. Multiple regression was used to identify predictors of overwork., Results: Almost 85% of nurses were categorized as overworked, of which, 30% were moderately to severely overworked. Gender, form of employment, stress related to ICU nursing technology and equipment updates, nurses' professional identity, and nurse working environment accounted for 36.6% in the ORFS., Conclusions: Overwork is common among ICU nurses. Nurse managers need to develop and implement strategies to better support nurses to prevent overwork., Competing Interests: Tian Xie and Wenhao He contribute equally. The authors declare no conflicts of interest., (Copyright © 2023 Wolters Kluwer Health, Inc. All rights reserved.)