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Purpose: This study aimed to examine the relationship between health-promoting behaviors and social jetlag and depression among shift-working nurses. Methods: A cross-sectional study was conducted among 130 shift-working nurses. Social jetlag was assessed using the Munich Chronotype Questionnaire for shift workers. Depression was measured using the Korean version of the Patient Health Questionnaire-9, and health-promoting behaviors were evaluated using the Health Promoting Lifestyle Profile II. Data were analyzed using frequency analysis, t-tests, one-way ANOVA, Pearson’s correlation coefficient, and multiple regression analysis with SAS 9.4. Results: The average social jetlag was 193.82 minutes for day shifts, 46.63 minutes for evening shifts, and 274.17 minutes for night shifts. Significant differences in social jetlag were associated with age, marital status, clinical experience, and shift preferences. Depression was significantly associated with subjective health status and attitudes toward night shifts. A negative correlation was found between health-promoting behaviors and depression (r=-.33, p<.001). Regression analysis revealed that depression (β=.20, p=.025) and subjective health status (β=.26, p=.004) negatively predicted health-promoting behaviors. Conclusion: Social jetlag and depression significantly influenced health-promoting behaviors among shift-working nurses. These findings suggest the importance of targeted health management strategies that address mental health and sleep disturbances to improve the well-being of shift- working nurses.