BackgroundStress and conflict in emergency departments are inevitable but can be managed. A supportive work environment is key to helping emergency care providers, especially nurses, constructively manage work‐related stress and conflict.AimThe aim of this study was to assess the influence of supportive work environments on work‐related stress and conflict management style among emergency care nurses.MethodsA descriptive correlational research design was utilized. Data were collected from 221 staff nurses recruited from two university hospital emergency departments in Alexandria, Egypt. Three instruments were used: (1) perceived organizational support scale, (2) nurses' occupational stressors scale, and (3) conflict management style inventory.ResultsThere was a highly significant correlation between supportive work environments and work‐related stress (p = .000) and a significant correlation between supportive work environments and conflict management style (p = .026). Supportive work environments had a significant inverse negative relationship with work‐related stress experienced by nurses (p = .001) and accounted for 51% of variance in work‐related stress. Meanwhile, supportive work environments had a significant positive relationship with conflict management styles of nurses (p = .026). Work‐related stress had a significant relationship with nurses' conflict management style (p = .000) and accounted for 45% of the variance in conflict management style.Linking Evidence to ActionThe style of conflict management modeled by staff within emergency departments can positively or negatively influence the work environment and level of work‐related stress. There is a necessity to cultivate a supportive culture for nurses in emergency departments to develop skills for constructive conflict management styles to reduce work‐related stress.