The purpose of this study is to explore the impact of administrative staff's job competency on their job satisfaction in a Korean research university. We conceptualized job satisfaction into three subcomponents: satisfaction in the job field, in the workplace, and with the actual task. In the regression analysis, we included demographics, inner motivation, work environments, and nature of work (e.g. clarity of task) factors as the predictors of job satisfaction. We included job competency as a main research variable in the model. This study found that the administrative staff's interpersonal skills affect their overall job satisfaction, and that each dimension of job competency (organizational understanding, problem solving, interpersonal skills, ICT skills, and global competency) has a different impact on the different dimensions of job satisfaction (job field, workplace, and job task).