- Half-life
- Halley, Edmond (1656-1743)
- Harrison, John (1693-1776)
- Hauptman, Herbert A. (1917- )
- Hawaiian Island Formation
- Hawking, Stephen (1942- )
- Herschel, Caroline Lucretia (1750-1848)
- Herschel, Sir William (1738-1822)
- Hess, Harry Hammond (1906-1969)
- Hildebrand, Alan Russell (1955- )
- Historical Geology
- History of Exploration I (Ancient and Classical)
- History of Exploration II (Age of Exploration)
- History of Exploration III (Modern Era)
- History of Geoscience: Women in the History of Geoscience
- History of Manned Space Exploration
- Holmes, Arthur (1890-1965)
- Holocene Epoch
- Hornfels
- Hotspots
- Howard, Luke (1772-1864)
- Hoyle, Fred (1915-1999)
- Hubble Space Telescope (HST)
- Hubble, Edwin (1889-1953)
- Humboldt, Alexander von (1769-1859)
- Humidity
- Hutton, James (1726-1797)
- Hydrocarbons
- Hydrogeology
- Hydrologic Cycle
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