- National Academy of Sciences
- National Ambient Air Quality Standards
- National Association of County and City Health Officials
- National Association of Local Boards of Health
- National Asthma Education and Prevention Program
- National Center for Health Statistics
- National Death Index
- National Disease and Therapeutic Index
- National Environmental Policy Act of 1969
- National Health Insurance
- National Health Surveys
- National Health Systems
- National High Blood Pressure Education Program
- National Institute for Occupational Safety and Health
- National Institute of Environmental Health Sciences
- National Institute On Aging
- National Institute On Drug Abuse
- National Institutes of Health
- Natural Disasters
- Needle Exchange Program
- Needlestick
- Neighborhood Health Centers
- Newborn Screening
- Nightingale, Florence
- Noise
- Nomogram
- Noncommunicable Disease Control
- Nongovernmental Organizations, United States
- Nonionizing Radiation
- Nonmaleficence
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