Fort Detrick /ˈdiːtrɪk/ is a United States Army Medical Command installation located in Frederick, Maryland. Historically, Fort Detrick was the center of the US biological weapons program from 1943 to 1969. Since the discontinuation of that program, it has hosted most elements of the United States biological defense program.
As of the early 2010s, Fort Detrick's 1,200-acre (490 ha) campus supports a multi-governmental community that conducts biomedical research and development, medical materiel management, global medical communications and the study of foreign plant pathogens. It is home to the U.S. Army Medical Research and Material Command (USAMRMC), with its bio-defense agency, the U.S. Army Medical Research Institute of Infectious Diseases (USAMRIID). It also hosts the National Cancer Institute-Frederick (NCI-Frederick) and is home to the National Interagency Confederation for Biological Research (NICBR) and National Interagency Biodefense Campus (NIBC).
Fort Detrick is the largest employer in Frederick County, Maryland.