In Cambodia, the number of nurses is insufficient and details of nursing services are unknown and undocumented. This research explored who provides nursing service activities in Cambodia. The study was conducted at nine hospitals in Cambodia. Findings indicate that non-invasive medical care such as vital signs taking was designated to nurses. In performing more complex medical interventions, nurses shared the tasks with medical doctors. Conversely, simpler nursing tasks, including maintaining bedside environment/hygiene and supporting patient activities, tasks were shared by nurses with patients' family. This study elucidated an optimal personnel mix and task shared between nurses, doctors and patients' families. There are important implications for nursing legislation related to streamlining the production of nurses to provide an adequate and qualified nursing service in Cambodia.