The purpose of this study was to examine the impacts of individual factors, such as demographic characteristics, personality types and cognitive styles, on job satisfaction of university librarians. The study further investigated the relationships and interaction effects among those factors. Three independent variables examined were demographic characteristics (sex, age, year at work, and position), personality types (Type A and Type B), and cognitive styles (Held-dependence and Held-independence). The dependent varilable was the level of job satisfaction. five factors that affect the level of job satisfaction were the nature of work, salary level promotion practices, supervision style, and the relationships with co-wokers. The number of subjects participated in the study was 166 university librarians working in Pusan area. The SPSSWIN package was used for statistical analysis.