The purpose of this study was to identify factors influencing professional self-concept among nursing students. A descriptive survey design was used with convenience sample of 250 nursing students studying in 1 nursing college. The data were obtained from November 17 to 30, 2012 by self-reported questionnaire. The collected date were analyzed using SPSS WIN 18.0 program. The mean score for professional self-concept, self-esteem and, self-efficacy were at the intermediate level, with the value of 3.27, 3.14 and 3.78. There were moderate positive correlation between the professional self-concept and self-esteem(r=0.580, p<.001), the professional self-concept and self-efficacy (r=0.645, p<.001) and there were moderate positive correlation between self-esteem and self-efficacy(r=0.611, p<.001). The influencing factors in professional self-concept of nursing students were self esteem, self efficacy, and motivation of nursing(Adj $R^2=.479$). In order to encourage nursing college students professional self-concept, the nursing college should make efforts to develop a curriculum and program for improving self-esteem and self-efficacy.