The NIH org chart refers to the organizational structure of the National Institutes of Health in the United States. It is the property of the United States Department of Health and Human Services (HHS). The primary missions of the National Institutes of Health are to seek fundamental knowledge about the nature and behavior of living systems to improve national health and prevent illness. More information about the NIH organizational chart can be found by clicking on the NIH org chart below. The American National Institutes of Health is divided into 27 Institutes and Centers. Each division has its own functions and responsibilities for various research programs.