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Accessible Summary: What is known on the subject?: The importance of and interest in nurses' attitudes towards and subjective experience with workplace violence in clinical settings is increasing.The prevalence of patient‐perpetrated violence against Korean nurses in hospital settings is highly prevalent.Only few instruments are available to measure the nurses' perception of patient aggression in Korea. What the paper adds to existing knowledge?: This is the first study to assess the linguistic and psychometric reliability and validity of an instrument that evaluates the attitude of Korean nursing staff towards patient‐perpetrated workplace violence. What are the implications for practice?: This valid and reliable instrument could be used to assess and monitor the nurses' attitudes towards aggressive tendencies in the workplace.The results could contribute to the development of relevant interventions for coping with violence by patients towards nursing staff and the implementation of practical training to cultivate healthy perceptions towards patients to foster therapeutic nurse–patient relationships. Introduction: Despite the high prevalence of patient‐perpetrated violence against Korean nurses globally, reliable and valid measures of patient aggression are lacking in Korean. Aim: We translated the 12‐item Perception of Aggression Scale (POAS) into Korean and psychometrically assessed its utility in measuring nurses' attitudes towards aggression. Methods: The 12‐item Korean POAS was obtained through forward–backward translation and cognitive debriefing. It was administered online to 319 nurses (mean age = 32.64 years; females = 96.2%), of which 206 completed it again after two weeks. Confirmatory factor analysis validated the 3‐factor structure as hypothesized in the original version. The intra‐class correlation coefficient was used to assess the test–retest reliability. Results: The originally hypothesized 3‐factor structure showed a good fit. The 3 dimensions: aggression as a dysfunctional or undesirable phenomenon, aggression as a functional or comprehensible phenomenon, and aggression as a protective measure had internal consistencies of 0.74, 0.86 and 0.90 and corresponding ICCs of 0.70, 0.86 and 0.90, respectively. Discussion: The 12‐item Korean POAS is a valid and reliable scale that might aid investigating nurses' attitudes towards patient aggression. Implications for practice: The 12‐item Korean POAS can help Korean nurses adopt protective behaviours and develop interventions to cope with aggression. [ABSTRACT FROM AUTHOR]