This is an Open Access article distributed under the terms of the Creative Commons Attribution NoDerivs License. (http://creativecommons.org/licenses/by-nd/4.0)If the original work is properly cited and retained without any modification or reproduction, it can be used and re-distributed in any format and medium. Purpose: This research aimed to investigate the effects of a cognitive rehearsal program (CRP) on workplace bullying among nurses. Methods: A randomized controlled trial was performed. Participants were 40 nurses working in different university hospitals in B city, South Korea. The experimental group was provided with a 20-hour CRP comprising scenarios on bullying situations, standard communication, and role-playing. To evaluate effects of the CRP, we measured interpersonal relationships, workplace bullying, symptom experience, and turnover intention at preand post-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 experimental and 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 for workplace bullying improves interpersonal relationships and decreases turnover intention. So it can be utilized as one of the personal coping strategies to reduce the the turnover among nurses. Further studies on the effects of unit-or hospital-based CRP and on the long-term effects of CRP are necessary. A typical intervention for reducing workplace bullying among nurses is raising awareness, for which research has found some support [7]. Nevertheless, considering that workplace bullying is entrenched in the interpersonal relationships among colleagues to increased knowledge and awareness of workplace bullying, as well as confidence in managing conflict situations. In a later study, they followed up over 6 months, and reported turnover intention decreased [13]. However, none of these studies used a control group and all of them provided a onetime, short-term intervention. Thus, stricter, randomized controlled trials are needed, which prompted the design of the present study with CR program (CRP). The aim of this study was to investigate the effect of CRP on the interpersonal relationships, workplace bullying, symptom experience, and turnover intention of nurses. The study hypotheses are as follows:Hypothesis 1: The interpersonal relationships those who participated in CRP (experimental group) will differ from those of who did not participate in CRP (wait-list group).Hypothesis 2: The workplace bullying in the experimental group will differ from that of the wait-list group.Hypothesis 3: The symptom experience in the experimental group will differ from that of the wait-list group.Hypothesis 4: ...