Drawing on the victim precipitation theory and self-esteem theory, this study examines the dispositional antecedents and consequences of workplace ostracism. Using data from 208 employees and their 96 immediate supervisors in two petroleum and gas companies in China, this study finds that agreeableness and extraversion are negatively, and neuroticism is positively related to workplace ostracism. Moreover, workplace ostracism is found to be negatively related to employee job performance, and this relationship is mediated by employee organization-based self-esteem.