The purposes of this study were to measure job satisfaction levels of dietitians engaged a in contract food service management company, and to examine the impacts of personal characteristics and organizational characteristics on the job satisfaction of dietitians. The questionnaires developed for this study were distributed to 230 dietitians of contract food service management companies in the Seoul and Gyeonggi areas, and a total of 187 (81.3%) questionnaires were used for analysis. Statistical analyses were completed using SPSS (Win 11.5) for descriptive analysis, correlation analysis, t-test and ANOVA. The average job satisfaction score of the dietitians was 2.83, which is lower than "not satisfied" and "not dissatisfied" (3), "Marital status" (p < 0.001), "payroll per year" (p < 0.001), "age" (p < 0.05) and "work experience as a dietitians" (p < 0.05) had significant effects on job satisfaction of work and environmental factors. "Operating group" (p < 0.05), "type of menu" and "type of service" also affected the job satisfaction. Overall, it is important that managers of contract food service management companies establish specified human resource management strategies with understandings of the characteristics of their dietitians and companies to enhance the job satisfaction of dietitians, and to achieve their managerial goals.