- Naegleria fowleri Infection
- Nairovirus Infection — Crimean-Congo hemorrhagic fever (CCHF)
- National Antimicrobial Resistance Monitoring System (NARMS)
- National Breast and Cervical Cancer Early Detection Program (NBCCEDP)
- National Comprehensive Cancer Control Program
- National Data — see Health, United States
- National Electronic Disease Surveillance System Base System (NBS)
- National Environmental Assessment Reporting System (NEARS)
- National Environmental Public Health Tracking Program
- National Health and Nutrition Examination Survey (NHANES)
- National Health Interview Survey (NHIS)
- National Health Statistics Reports (NHSR)
- National Healthcare Safety Network (NHSN)
- National Home and Hospice Care Survey (NHHCS)
- National Hospital Discharge and Ambulatory Surgery Data
- National Influenza Vaccination Week (NIVW)
- Influenza
- Influenza Vaccination
- National Intimate Partner and Sexual Violence Survey (NISVS)
- National Notifiable Diseases Surveillance System (NNDSS)
- National Nursing Home Survey (NNHS)
- National Occupational Injury Research Symposium (NOIRS)
- National Occupational Research Agenda (NORA)
- National Outbreak Reporting System (NORS)
- National Program of Cancer Registries
- National Report on Human Exposure to Environmental Chemicals
- National Surveillance of Bacterial Foodborne Illnesses (Enteric Diseases)
- National Survey of Family Growth (NSFG)
- National Syndromic Surveillance Program (NSSP)
- National Toxic Substance Incidents Program (NTSIP)
- National Violent Death Reporting System (NVDRS)
- National Vital Statistics Reports
- Natural Disasters — see Extreme Weather Conditions
- Necator americanus Infection — see Soil-Transmitted Helminths
- Neglected Tropical Diseases (NTD)
- Neisseria gonorrhoeae Infection — see Gonorrhea
- NERD Academy
- Neurocysticercosis — see Cysticercosis
- Neutropenia
- New Vaccine Surveillance Network (NVSN)
- Newborn Hearing — see Hearing Loss, Noise-Induced
- Newborn Screening
- NHANES Tutorial
- NIOSH Extramural Research and Training
- NIOSH Manual of Analytical Methods (NMAM)
- NIOSH Pocket Guide to Chemical Hazards (NPG)
- NIOSH Research Programs
- Nipah Virus Infection (NiV Infection)
- Nitrogen Mustard (HN-1, HN-2, HN-3)
- NNDSS — see National Notifiable Diseases Surveillance System (NNDSS)
- NNDSS Modernization Initiative (NMI)
- NNDSS Modernization Initiative (NMI) — see Modern Initiative
- Nocardia Infection
- Nocardiosis — see Nocardia Infection
- Noise
- Noise Exposure
- Non-Polio Enterovirus Infections
- Nonpharmaceutical Interventions (NPIs)
- Nontuberculous — see Nontuberculous Mycobacteria Infections (NTM)
- Nontuberculous Mycobacteria Infections (NTM)
- Norovirus Infection
- Norwalk-like Viruses (NLV) — see Norovirus Infection
- NSSP — see National Syndromic Surveillance Program (NSSP)
- Nursing Homes, Infection Prevention in — see Long-Term Care Facilities, Infection Prevention in (LTCFs)
- Nutrition
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