Encyclopedias, Almanacs, Transcripts, and Maps
- Hesdin, Jacquemart de
- Heshmon
- Hesse-Darmstadt
- Hesse-Nassau
- Hesselius, Gustavus
- Hessian fly
- Hesychius of Alexandria
- Hetch Hetchy Valley
- Hewes, Joseph
- Hewish, Antony
- Hewitt, Peter Cooper
- Hewlett Foundation
- Hewlett, Maurice Henry
- Hewlett, William Redington
- hexahedron
- Heym, Georg
- Heym, Stefan
- Heymans, Corneille
- Heyrovsky, Jaroslav
- Heyward, Thomas