- H ... Haarlem Mannerists
- Haarlem school ... Habré, Hissène
- Habrobracon ... Haddad, Malek
- Ḥaddād, Nuhād al- ... Haeckel, Ernst
- Haeckel, Ernst Heinrich Philipp August ... Hagan, Kay
- Haganah ... Hai
- Hai ben Sherira ... hair-cap moss
- hairawn muhly ... Hakemite Tables
- Haken, Wolfgang ... Haldas, Las
- Haldefjäll ... half-track
- half-truth ... Hall v. DeCuir
- Hall voltage ... Hallelujah
- Hallelujah ... halophile
- halophilic organism ... Hambletonian Hills
- Hambletonian Stakes ... Hamilton Tigers
- Hamilton’s equations ... Ḥammādid dynasty
- Ḥāmmah, Al- ... Hampshire Downs
- Hampson, Sharon ... Ḥanafīyah school
- Ḥanafiyyah school ... Handel, George Frideric
- Handelius, Jacobus ... hanging wall
- Hanging, A ... Hannong, C. F.
- Hannong, Joseph-Adam ... Hansteen, Christopher
- Hanstholm ... Happy Prince and Other Tales, The
- Happy Prince, The ... Harbel
- Harbin ... hardcore punk
- Hardecanute ... Hardy, Thomas
- Hardy, Tom ... Harizi, Judah ben Solomon
- Härjedalen ... harmonic motion, simple
- harmonic number ... Harper, Frances Ellen Watkins
- Harper, Ida A. Husted ... Harris, Frank
- Harris, Fred ... Harrow School
- Harrsalz ... Hartford Whalers
- Hartford wits ... Harvard University
- Harvard University Library ... Hasard et la nécessité, Le
- Ḥāṣbānī ... Hassenpflug, Hans Daniel Ludwig Friedrich
- Hassi Messaoud ... Hathaway, Henry
- Hatherly, Ana ... Haunted Land, A
- Haunted Life, and Other Writings, The ... Haüy, René-Just
- Haüy, Valentin ... Hawaiian Islands
- Hawaiian language ... Hawksmoor
- Hawksmoor, Nicholas ... Hayden’s Ferry
- Hayden, Carl T. ... haystack hill
- Haystack Observatory ... HBOS
- HBOT ... head-mounted display
- Head-Smashed-In Buffalo Jump ... Healy v. James
- Healy, George ... heart-flowered serapias
- heart-leaf philodendron ... Heath, Sir Edward
- Heath, Sir Edward Richard George ... Hebei
- Hebei Plain ... Hedda Gabler
- Hedda Stone ... Hegel, G. W. F.
- Hegel, Georg Wilhelm Friedrich ... Heiman, Salomon
- Heimat ... Hejaz Railway
- Hejaz-Jordan Railway ... helicon wave
- Helicon, Mount ... Hellanicus of Lesbos
- hellanodikai ... Helmert, Friedrich R.
- helmet ... Helvella
- Helvella gigas ... Hemingway, Ernest Miller
- Hemingway: The Writer as Artist ... hemorrhagic telangiectasia
- hemorrhoid ... Hengzhou
- Henie, Sonja ... Henry I
- Henry I ... Henry VI, Part 2
- Henry VI, Part 3 ... Hepatica
- hepatica ... Heracleides of Pontus
- Heracleides Ponticus ... Herbertson, Andrew John
- herbes folles, Les ... hereditary hypophosphatemic rickets
- hereditary leptocytosis ... Hermann, Wilhelm
- Hermannia verticillata ... hernia
- herniated disk ... herpes simplex virus type 2
- herpes zoster ... Hershey Foods Corporation
- Hershey, A. D. ... Hesilrige, Sir Arthur, 2nd Baronet
- Hesiod ... Heterodontus philippi
- Heterodontus portusjacksoni ... Hets
- Hetsilinga ... hexanoic acid
- Hexapla ... Hiba arborvitae
- Hibbard, Hall ... Hidden Fortress, The
- Hidden Game of Baseball, The ... Higashiyama period
- Higden, Ranulf ... High Noon
- High Note, The ... high-pressure phenomena
- high-pressure sodium-vapour lamp ... Hightower, Jim
- Hightower, Rosella ... Hilda group
- Hilda Lessways ... Ḥillah, Al-
- Hillary and Clinton ... Himalayan
- Himalayan bear ... Hinduism
- Hindūshāh, Muḥammad Qāsim ... Hippius, Zinaida Nikolayevna
- hippo ... Hiroa, Te Rangi
- Hirohito ... Ḥiṣn al-Ghurāb
- Ḥiṣn Manṣūr ... Histoire ecclésiastique
- Histoire et mémoires de l’Académie ... Historias de cronopios y de famas
- Historic ... History of Emily Montague
- History of England ... History of the Indies
- History of the Introduction of Christianity in China ... Hite Report on Women and Love: A Cultural Revolution in Progress, The
- Hite Report, The ... Hmong
- Hmong language ... Hoban, Russell
- Hoban, Russell Conwell ... Hodes, Art
- Ḥodesh, ha- ... Hoffmann, Christoph
- Hoffmann, E. T. A. ... hogueras, Las
- Hogwarts ... Holborn
- Holbrook, Hal ... Holland, Clifford Milburn
- Holland, Georg von ... Hollywood or Bust
- Hollywood Park ... Holroyd, Michael
- Holroyd, Sir Michael de Courcy Fraser ... Holy Mountain
- Holy Mountain, The ... Home Alone
- Home Alone 2: Lost in New York ... Homer Dictating to His Scribes
- Homer, Louise ... homocysteine
- homocystinuria ... Hon’ami Kōetsu
- Hon’ami Kōyetsu ... honeysuckle
- honeysuckle family ... Honoratus of Arles, Saint
- Honoratus, Marius Servius ... Hook, Sidney
- Hook, Theodore Edward ... Hope Springs
- Hope Theatre ... hora nacional, La
- Horace ... Hormizd-Ardashīr
- Hormizdagān, Battle of ... Horner, William George
- hornero ... horse sugar
- horse trials ... Horwitz, Jerome
- Horwitz, Moses ... hot break
- Hot Buttered Soul ... Hôtel National des Invalides
- Hotel New Hampshire, The ... hound
- Hound Dog ... House of Strangers
- House of Tears ... Houston Oilers
- Houston Post ... How start-ups move from seed funding to Series C
- How Stella Got Her Groove Back ... Howard, Henry
- Howard, Henry ... Howland Island
- howler ... hsaing waing
- Hsaya San ... Hsüan-tsang
- Hsüan-tsung ... huaju
- Hualalai ... Huayan Temple
- Huayang Mountains ... Hudson
- Hudson Bay ... Hugh of Cluny, Saint
- Hugh of Lincoln, Little Saint ... hui-kuan
- Hui-neng ... Hulme, Keri
- Hulme, T. E. ... human papillomavirus
- human papillomavirus quadrivalent vaccine, recombinant ... Humboldt Glacier
- Humboldt penguin ... Humphreys University
- Humphreys, Andrew Atkinson ... Hungarian Democratic Forum
- Hungarian Football Team: The Magnificent Magyars, The ... Hunt, Richard Morris
- Hunt, Roger ... Hunts of the Dukes of Devonshire, The
- Huntsman and Dogs ... Hurricane Fifi
- Hurricane Hattie ... hussar monkey
- Hussarek von Heinlein, Max Hussarek, Freiherr ... Huxley, Aldous Leonard
- Huxley, Hugh Esmor ... hyaenodont
- Hyaenodontidae ... Hydraenidae
- hydralazine ... hydrocodone
- hydrocooling ... Hydromys chrysogaster
- hydronephrosis ... Hyeniaceae
- Hyeniales ... Hymnes
- Hymnes and Songs of the Church, The ... hyperidrosis
- hyperimmune serum globulin ... Hyphochytriomycota
- Hyphomicrobium ... Hyposmocoma
- Hyposmocoma molluscivora ... Hytner, Sir Nicholas Robert
- Hytrel ... H̱ula Valley
