Purpose: The purpose of this study was to investigate the factors related to burnout of nurses working at intensive care units. Methods: The subjects of this study included 149 nurses in intensive care units at six general hospitals. The data was analyzed using the SPSS/WIN 23.0 program with descriptive statistics, t-test, ANOVA, Scheffé test, Pearson correlation coefficient, and Stepwise multiple regression analysis were used. Results: The factors significantly affecting burnout included work stress ‘high to very high’ (β=.39, p<.001), communication skill (β=-.24, p=.001), subjective health status ‘normal’ (β=.22, p=.001) and ‘bad to very bad’ (β=.20, p=.002) and problem-driven coping (β=-.19, p=.010) in order, and the explanatory power of these factors to the burnout was 46.3%. Conclusion: Based on the results, effective interventions need to be provided to improve intensive care unit nurses’ health conditions and to relieve their work stress. It is necessary to develop practical strategies to improve nurses’ communication and stress coping skills to reduce their burnout.