- H ... Haarlem Mannerists
- Haarlem school ... Habré, Hissène
- Habrobracon ... Haddad, Malek
- Ḥaddād, Nuhād al- ... Haeckel, Ernst Heinrich Philipp August
- Haedo Hills ... Haganah
- Hagano ... Hai ben Sherira
- Hai Duong ... hairawn muhly
- hairball ... Hakemite Tables
- Haken, Wolfgang ... Haldas, Las
- Haldefjäll ... half-truth
- half-uncial ... Hall, Adelaide
- Hall, Alexander ... Hallelujah Psalm
- Hallelujah Trail, The ... Haloragidaceae
- Halosydna ... Hamburg
- Hamburg ... Hamilton, Alice
- Hamilton, Andrew ... Ḥammāmī, Saʿīd
- Ḥammān ... Hampton Academy
- Hampton Court ... Hanaoka Seishū no tsuma
- Hanare Kirishitan ... Handharmonika
- handheld computer ... hangover
- Hangover Part II, The ... Hanoi Poison Plot
- Hanoi, Tower of ... Hantzsch, Arthur Rudolf
- Ḥanukka ... Happy-Go-Lucky
- Happytime Murders, The ... harbour seal
- Harbour, David ... Hardenberg, Karl August, von
- hardened target munition ... hare’s-tail grass
- Hare, David ... Harlan, John Marshall
- Harland and Wolff ... Harmonie
- Harmonies of the World ... Harpidae
- Harpignies, Henri ... Harris, Katherine
- Harris, LeRoy Ellsworth ... Harry Potter and the Half-Blood Prince
- Harry Potter and the Half-Blood Prince ... Hartley, Marsden
- Hartley, R. V. L. ... harvester
- harvester ... hash mark
- hash sign ... Hastings
- Hastings ... Hatsa language
- Hatschek’s pit ... Hauriou, Maurice-Jean-Claude-Eugène
- Hauru no ugoku shiro ... Havdala
- Havdalah ... Hawātmeh, Naif
- Hawātmeh, Nayif ... Ḥawrān
- Hawrani, Akram al- ... Haye, La
- Haye, Sir Gilbert of the ... Haywood, Bill
- Haywood, Eliza ... HDCV
- HDE 226868 ... Headley, Maria Dahvana
- headlight ... Heard, John
- Heard, Sarah Jane ... heartland
- heartleaf foamflower ... Heaton’s Furnace
- Heaton, John ... Hebrew Bible
- Hebrew calendar ... Hedgeman, Peyton Cole
- hedgerow ... Heian shrine
- Heian-kyō ... Heines, Edmund
- Heinesen, Jens Pauli ... Held des Nordens, Der
- Held in Bondage ... heliography
- heliogravure process ... Hellenic War
- Hellenica ... Helms, Ed
- Helms, Jesse ... hemangioma
- hemangioma, infantile ... Hemitragus hylocrius
- Hemitragus jayakari ... Henan
- Henana ... Hennig, Willi
- hennin ... Henry IV
- Henry IV ... Henry, O.
- Henry, Patrick ... hepatorenal syndrome
- hepatoscopy ... Herald, The
- Herald, The ... Hercules beetle
- Hercules Fountain ... Heretic, The
- Heretica ... Hermeticism
- Hermeticism ... Herodes Atticus
- Herodes Magnus ... Herrera, Francisco, the Elder
- Herrera, Francisco, the Younger ... Hertz, John D.
- Hertz, Joseph Herman ... Hess, Walter Richard Rudolf
- Hess, Walter Rudolf ... heteromorphosis
- Heteromyidae ... Hevajra-tantra
- Hevea brasiliensis ... Heyden, Jan van der
- Heydrich, Reinhard ... hibonite
- Ḥibr, al- ... Hiei-zan
- Hiei-zan ... High Anxiety
- High Arctic ... High Speed 1
- High Speed Train ... high-warp loom
- high-yield bond ... Hiiumaa
- Hija de la fortuna ... Hill Mariā
- hill mynah ... Hillier, Rick
- Hillingdon ... Himmelfahrt
- Himmerland ... hinny
- Hino ... Hippolytus, Canons of Saint
- Hippomane mancinella ... Hirschsprung disease
- Hirshbein, Peretz ... Histioteuthis
- histochemistry ... Historia de omnibus gothorum sueonumque regibus
- História de Portugal ... historical relativism
- historical school of economics ... History of Mexico, The
- History of Mount Allison ... History of the United States of America
- History of the War in the North Against the Chief Heke, The ... Hiva Oa
- hive ... Ho-Chunk
- Ho-fei ... Hobocan
- Hôbôgirin. Dictionaire du Bouddhisme d’après les sources chinoises et japonaises ... Hoeffer, Norman Foster
- Hoeffler, Anke ... Hofuf, Al-
- Hofvijver ... hojarasca, La
- Hojas al viento ... Holding, Thomas Hiram
- holding-operating company ... Hollies, the
- Holling, C. S. ... Holmström, Bengt Robert
- Holness, Andrew ... holy
- Holy Alliance ... holy water
- Holy Week ... Home Rule League
- home run ... Hominini
- hominium ... homology
- homology group ... Honest Thief
- honestiores ... Hongloumeng
- Hongqi Canal ... Hood, John B.
- Hood, John Bell ... Hoorne, Filips van Montmorency, count van
- Hoorne, Filips van Montmorency, graaf van ... Hopkins, Stephen
- Hopkinsianism ... horizon of predictability
- horizon system ... hornblendite
- Hornblower, Horatio ... Horoztepe
- horreum ... Horsley-Clarke apparatus
- Horsmanden, Daniel ... hospitalization insurance
- Hospitaller Order of St. John of God ... hot-smoking
- hot-spot volcano ... Hou Jin dynasty
- Hou Liang dynasty ... House Divided, A
- house finch ... household
- household appliance ... Hovhannes IV Otznetzi
- Hovick, Rose Louise ... Howard, Charles
- Howard, Charles ... Howick, Charles Grey, Viscount
- Howick, Henry George Grey, Viscount ... Hrušovský, Ivan
- Hrvati ... Hsü Ta
- Hsü Wei ... Huai-yin
- Huaihai ... Huasipungo: The Villagers
- Huastec ... ḥudāʾ
- Hudde, Johan van Waveren ... Hugh
- Hugh Capet ... Hui
- Hui Autonomous Region of Ningxia ... Hull, Josephine
- Hull, Josephine Sherwood ... human mortality
- Human Nature ... humble plant
- humble-bee ... Humphrey, Duke of Gloucester
- Humphrey, George M. ... Hungaria group
- Hungarian ... Hunt, John Hunt, Baron
- Hunt, Leigh ... Huntington, Samuel P.
- Huntley, Chet ... Hurrian
- Hurrian language ... Huss, Jan
- Huss, John ... Hutu revolution
- Hutuo River ... hyaena
- Hyaena brunnea ... Hydra
- Hydra ... Hydrochoerus
- Hydrochoerus hydrochaeris ... hydrometer
- Hydrometridae ... Hyemoschus
- Hyemoschus aquaticus ... hymnal
- hymnal stanza ... Hypericum perforatum
- Hypericum stans ... hypho-borane
- hypho-carborane ... Hyporthodus nigritus
- hyposensitization ... Hystrix cristata
- Hythe ... H̱ula Valley