Encyclopedias, Almanacs, Transcripts, and Maps
- Hongshan Pyramid Discovered in China
- Honorton, Charles (1946-1992)
- Hoodia
- Hoodoo Sea
- Hooper, T. d'Aute (ca. 1910)
- Hoopoes: Upupidae
- Hope Diamond
- Hope, William (1863-1933)
- Hopkins, Budd (1931-)
- Hopkins, Emma Curtis (1849-1925)
- Horace Bénédict de Saussure
- Horbehutet
- Hörbiger, Hans (1860-1931)
- Hormesis
- Hormones and the Discovery of Insulin
- Hornbills: Bucerotidae
- Horniman, Annie (1860-1937)
- Horos, Theodore (ca. 1866-?) and Laura(1849-ca. 1906)
- Horoscope Guide
- Horoscope Yearbook