Purpose: This research aimed to investigate the effects of a cognitive rehearsal program (CRP) on workplace bullying among nurses. Methods: Arandomized controlled trial was performed. Participants were 40 nurses working in different university hospitals in B city, South Korea. The experimentalgroup was provided with a 20-hour CRP comprising scenarios on bullying situations, standard communication, and role-playing. Toevaluate effects of the CRP, we measured interpersonal relationships, workplace bullying, symptom experience, and turnover intention at preandpost-intervention. Follow-up effect was measured in the experimental group only at 4 weeks after the intervention. Results: After the intervention,there were significant differences in interpersonal relationships (F=6.21, p=.022) and turnover intention (F=5.55, p=.024) between experimentaland wait-list groups. However, there was no significant difference in workplace bullying or symptom experience between the 2 groups. The beneficial effects on interpersonal relationships and turnover intention lasted at least up to 4 weeks after CRP. Conclusion: The CRP forworkplace bullying improves interpersonal relationships and decreases turnover intention. So it can be utilized as one of the personal copingstrategies to reduce the the turnover among nurses. Further studies on the effects of unit- or hospital-based CRP and on the long-term effectsof CRP are necessary.