Encyclopedias, Almanacs, Transcripts, and Maps
- Hoover Institution on War, Revolution, and Peace
- Hopeh
- Hopei
- Hopewell Culture National Historical Park
- Hopewell Furnace National Historic Site
- Hophni
- Hophra
- Hopkins, Edward
- Hopkinsville
- Hoppe, Willie
- hopping mouse
- Horae
- Horam
- Hordaland
- Horgen
- Horites
- horizon coordinate system
- horizontal sounding balloon
- Horlivka
- Hormah