Legal Definition of Board of health: A group of people whose duties involve the safeguarding of the public’s health. They have many functions, including overseeing the hygiene and sanitary conditions of a community, the administration of immunizations to prevent communicable disease, and the keeping of health statistics. (Boards of health may have county, city, or state jurisdiction.) | Learn more about the legal definition and functions of a Board of Health. Discover how they safeguard public health by overseeing hygiene conditions, administering immunizations, and collecting health statistics. Understand the vital role they play in protecting communities from health risks and promoting overall well-being. Click here to find out more