Purpose: This study is a descriptive research study to understand the effect of compassion competence, clinical nursing character, and nursing professionalism on nursing service quality provided by long-term care hospital nurses. Methods: The participants were 187 nurses working in six long-term care hospitals. Data were collected from October 30 to December 5, 2023, and analyzed using the SPSS/WIN 26.0 program (descriptive statistics, one-way ANOVA, independent t-test, Scheffé test, Pearson’s correlation coefficients, and Multiple regression analysis). Results: As a result of this study, the nursing service quality of nursing hospital nurses was positively correlated with compassion competence (r=.59, p<.001), clinical nursing character (r=.67, p<.001), and nursing professionalism (r=.52, pp<.001). The factors affecting nursing service quality were clinical nursing character, nursing professionalism, and compassion competence. Also, the explanatory power of the model was 52.3% (F=69.09, p<.001, Adj R2 =.52). Conclusion The result of this study is meaningful in that they identified the factors affecting the quality of nursing service of long-term care hospital nurses and provided basic data for improving the quality of nursing services.