The study was examined to investigate the influence of nurse manager and peer group caring behaviors on organizational socialization and nursing performance Methods: The subjects were 286 clinical nurses from a general hospital in S city. The collected data were analyzed using descriptive statistics, t-test, ANOVA, Pearson correlation and hierarchical regression analysis with the SPSS 25.0 program. Nurse manager and peer group caring behaviors, organizational socialization, and nursing performance were measured using organizational climate for caring scale, peer group caring interaction scale, organizational socialization and performance measurement scale for hospital nurses. Results: There was no significant difference in organizational socialization between nurse manager and peer group caring behaviors. The significant predictors of nursing performance were position (β=-.26), nurse manager caring behaviors (β=.23), and peer group caring behaviors (β=.17). These variables explained 23% of the variance in nursing performance. Conclusion: The results suggest that it is necessary to increase both manager and peer group caring behaviors in order to improve nursing performance.