Purpose: The purpose of this study was to examine workplace violence (verbal, physical, and sexual violence) among nurses in intensive care units (ICU). Methods: This cross-sectional survey was done from November 8 to 27, 2010, using self-administered questionnaires. The responses of 251 nurses were analyzed. Results: The results of this study showed that ICU nurses frequently experience workplace violence. Verbal violence was more frequent than physical or sexual violence. The most frequent action taken by respondents after violence was seeking help from colleagues. Violence occurred most often when a patient`s mental status was altered or the patient had too much alcohol, and when the patient or family was not satisfied with the hospital services because of delay of test results or treatment. In addition, miscommunication between doctors and nurses or among nurses was a major reason for violent behavior. Nurses regarded public apologies, professional counseling, and communication skill training as effective methods to prevent or deal with violence. Conclusion: These results suggest that institutional and administrative support to promote a safe and efficient work environment in hospitals should be provided to minimize the possibilities of violent behavior by patients or patients` families directed at medical personnel.