| H II region ... Habitat for Humanity International |
| habitual offender ... Hadramawt |
| Hadrian ... Hague Agreement |
| Hague Convention ... Haiti: Year in Review 2001 |
| Haiti: Year in Review 2002 ... Halberstam, David |
| Haldane, Elizabeth Sanderson ... Halifax |
| Halifax ... Halle, Sir Charles |
| Halle-Wittenberg, Martin Luther University of ... Halysites |
| Ham ... Hamilton |
| Hamilton ... Hammerstein, Oscar, II |
| Hammett, Dashiell ... hanamichi |
| Hanau ... Hanks, Nancy |
| Hanks, Tom ... Hanuman |
| Hanumangarh ... Hardanger Plateau |
| Hardecanute ... Harihara |
| Harimandir ... Harmony |
| harmony ... Harriot, Thomas |
| Harris movement ... Harrow |
| harrow ... Harty, Sir Hamilton |
| Hartz Mountains ... Hashimiyah |
| Hashimoto disease ... hatchetfish |
| Hatchett, Charles ... Hauptmann, Bruno |
| Hauptmann, Gerhart ... Hawaii, University of |
| Hawaiian ... Hay, John |
| Hay, Oliver Perry ... Hays, Arthur Garfield |
| Hays, Will H. ... Health and Disease: Year in Review 1998 |
| Health and Disease: Year in Review 1999 ... heartland |
| hearts ... Hecate |
| Hecate Strait ... Hegang |
| Hegel, Georg Wilhelm Friedrich ... Heinsius, Anthonie |
| Heinsius, Daniel ... Helios |
| Helios ... Heloise |
| helot ... hemorrhoid |
| hemothorax ... Henrician Articles |
| Henrietta Anne Of England ... Henry VII |
| Henry VIII ... heraldry |
| Herat ... Herihor |
| Hering, (Karl) Ewald (Konstantin) ... Herne |
| Herne Bay ... Herrerasaurus |
| Herreshoff, Nathanael Greene ... Herwegh, Georg |
| Herz, Henri ... heteropteran |
| heterosis ... Hialeah |
| hiatus ... Higginson, Thomas Wentworth |
| Higgs boson ... Hilaria |
| Hilaria ... Hiller, Dame Wendy |
| Hiller, Ferdinand ... Hindenburg |
| Hindenburg Line ... Hippon |
| hippopotamus ... Hispaniola |
| Hispano-Moresque ware ... HIV |
| Hiva Oa ... Hobby-Eberly Telescope |
| Hobhouse, Emily ... Hoffman, Samuel Kurtz |
| Hoffmann von Fallersleben, August Heinrich ... Hohenwart, Karl Siegmund, Graf von |
| Hohenzollern Dynasty ... holism |
| holistic medicine ... Holocaust museum |
| Holocaust remembrance days ... Holyfield, Evander |
| Holyhead ... Homo sapiens |
| homocystinuria ... Honduras, Gulf of |
| Hone, William ... Honshu |
| Hontheim, Johann Nikolaus von ... Hopcroft, John Edward |
| Hope ... Horatian ode |
| Horatii and Curiatii ... Hornemann, Friederich Konrad |
| Horner, William George ... Horsham |
| Horsham ... Hotan |
| Hotchkiss machine gun ... House Un-American Activities Committee |
| House, Edward M. ... Howard, Robin |
| Howard, Ron ... Hsin-ying |
| Hsinbyushin ... Huastec |
| Huave ... Hudsonian orogeny |
| hudud, al- ... Huguenot |
| Huguet, Jaime ... Human Genome Project |
| Human Genome Project:Road Map for Science and Medicine: Year in Review 2001 ... humid continental climate |
| humid subtropical climate ... Hungary: Year in Review 1995 |
| Hungary: Year in Review 1996 ... Hunter, William |
| Hunter-Bowen orogeny ... Huronian System |
| Hurrian ... Hutchinson, Thomas |
| hutia ... Hydaspes, Battle of the |
| hydatidiform mole ... hydrogen cloud |
| hydrogen cyanide ... hymenomycetes |
| Hymenophyllaceae ... hypocoly |
| Hypodorian mode ... |
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