- Haemophilus
- Hancock, Robert Ernest William (1949- )
- Hand-Foot-Mouth Disease
- Hantavirus and Hanta Disease
- Hazard Analysis and Critical Control Points Program (HACCP)
- Hazen, Elizabeth (1885-1975)
- Heat Shock Response
- Helicobacteriosis
- Hemagglutinin (HA) and Neuraminidase(NA)
- Hemorrhagic Fevers and Diseases
- Hepadnaviruses
- Hepatitis and Hepatitis Viruses
- Herpes and Herpes Virus
- Hershey, Alfred Day (1908-1997)
- Heterotrophic Bacteria
- Histamine
- Histocompatibility
- History of Immunology
- History of Microbiology
- History of Public Health
- History of the Development of Antibiotics
- Hobby, Gladys Lounsbury (1910-1993)
- Hooke, Robert (1635-1703)
- Huang, Alice Shih-Hou (1939- )
- Human Immunodeficiency Virus (HIV)
- Human Leukocyte Antigen (HLA)
- Human T-Cell Leukemia Virus (HTLV)
- Hydrophobic and Hydrophilic
- Hydrothermal Vents
- Hygiene
