This study sought to investigate the contributing factors to and frequency of violence against health care workers (HCWs) working in western Turkey. The population is composed of a random sample of 1,209 HCWs from 34 health care workplaces. Written questionnaires were given to HCWs at all sites, where staff were instructed to register all types of violence they had experienced. In all, 49.5% of HCWs reported having experienced verbal, physical, or verbal and physical violence, with this total being made up of 39.6% men and 60.4% women. A larger percentage (69.6%) of general practitioners reported experiencing verbal abuse and physical violence by patients and patients' family members or friends. Younger workers, inexperienced staff, and those in emergency services were more likely to report violence. Violence directed toward HCWs is a common occupational hazard. Public health authorities should plan preventive interventions based on the findings of this study.