Several studies in the organisational citizenship behavior (OCB) literature have focused on the main effects of employee dispositions and job attitudes. The current study builds upon previous findings by examining whether core self-evaluations (CSE) moderate the relationship between job attitudes and OCBs. Consistent with our hypotheses and with the notion that CSE contributes to one's general level of initiative and self-confidence, data collected from 200 New Zealand workers found that the job attitude–OCB relationship was stronger for workers who were high in CSE than for workers who were low in CSE.