A crucial role of the nurse is to provide safe nursing care without missing anything. Unsafe care is a key contributor to morbidity and mortality in the world. This study aimed to identify the relationship between management functions and nursing care that were missed at three inpatient installations at regional general hospitals. The research used a quantitative approach with an analytic research and cross-sectional design. The sample consisted of 238 nursing staff comprising team leaders and implementing nurses who worked at Regional Hospitals A, B, and C. The management function (p = 0.001) and all its components of planning, organizing, staffing, direction, and control (p = 0.001; p = 0.001 p = 0.001; p = 0.001; p = 0.001) were significantly related. The management function and all its components are thus related to missed nursing care. The recommendation is to improve the quality of the implementation of the nursing management function. © JKI 2022.