ObjectivesDespite numerous published concept analyses of nursing competency, the specific understanding of trauma nursing competency in emergency departments remains limited, with no clear definition. This study aimed to clarify the definitions and attributes of trauma nursing competencies in emergency departments.DesignWalker and Avant’s method was used to clarify the concept of trauma nursing competency in emergency departments.Data sourcesPubMed, EMBASE, CINAHL and RISS were searched from inception to 23 April 2023.Eligibility criteriaRelevant studies that included combinations of the terms ‘nurse’, ‘nursing’, ‘emergency’, ‘trauma’, ‘competency’, ‘capability’ and ‘skill’ were selected. We restricted the literature search to English and Korean full-text publications, with no limit on the publication period; grey literature was excluded.Data extraction and synthesisThis study uses defining attributes, antecedents and consequences extracted through data analysis. To aid comprehension of the model, related and contrary cases of the concept were created, and empirical referents were defined.ResultsAfter excluding duplicates, irrelevant studies, incomplete texts and articles unrelated to the context and study population, 15 of the initial 927 studies were included. Five additional studies were added after a manual search of the references. The final concept analysis therefore included 20 studies. The attributes of trauma nursing competency for emergency nurses included ‘rapid initial assessments considering injury mechanisms’, ‘priority determinations based on degrees of urgency and severity’, ‘clinical knowledge of trauma nursing’, ‘skills of trauma nursing’, ‘interprofessional teamwork’ and ‘emotional care’.ConclusionsThe concept analysis revealed that it is possible to promote the enhancement and development of trauma nursing competency in emergency departments across various contexts, such as clinical practice, education, research and organisational settings. This could ultimately improve trauma nursing quality and treatment outcomes.