- I ... I Heart Huckabees
- I Hope I Shall Arrive Soon ... I’ll Take My Stand
- I’ll Take You There ... IAM
- iamb ... Ibero-Maurusian industry
- Iberoamerica ... Ibn Khallikān
- Ibn Khallikan’s Biographical Dictionary ... IBT
- ibuprofen ... Ice Road, The
- ice scour ... Ichneutai
- ichthyology ... ʿĪd al-Ṣaghīr, al-
- id Software ... Idella
- Idelsohn, Abraham Zevi ... Idjil
- Idkū ... If It Die…
- If It Had Happened Otherwise ... Iglesias Turrión, Pablo
- Iglesias, Julio ... ihram
- IHT ... Ikorodu
- Ikot Abasi ... Ilha da Madeira
- Ilha das Flores ... Illinois Central Railroad Co. v. Illinois
- Illinois College ... Ilos
- ILP ... Imago mundi
- Imalayan, Fatima-Zohra ... Immanuel Church
- immaturity ... impact ionization
- impact period ... Imperial Russian Ballet
- imperial school ... Impresso complex
- imprimatur ... In Cold Hell, in Thicket
- In Country ... In Suprema Petri Apostoli Sede
- In the Arena ... INA
- Inaccessible ... incident
- Incident at Vichy ... Incorruptibility
- Incredible Borgias, The ... independent record labels
- Independent Republicans ... Indian buffalo
- Indian Charlie ... Indian pangolin
- Indian Peace-Keeping Force ... Indianista novel
- Indianola ... indispensability argument
- Inditex ... Indonesische Vereeniging
- indoor air pollution ... Indus Plain
- Indus River ... inelastic neutron scattering
- inelastic scattering ... inferior conjunction
- inferior court ... informal diversion
- informal economy ... Ingelger
- Ingelow, Jean ... inhibition
- inhibitor ... inland taipan
- inland water body ... Innocent XI Blessed
- Innocent XII ... Inscription Maritime
- Inscription Rock ... Instauratio Magna
- INSTEX ... Insular script
- insular Southeast Asia ... intellectual virtue
- intellectual-property law ... interaction, fundamental
- interaction, social ... interference removal
- interferogram ... intermediate yellow fever
- intermediate, chemical ... International America’s Cup Class
- International Anarchist Congress ... International Conference on Harmonisation of Technical Requirements for Registration of Pharmaceuticals for Human Use
- International Conference on Naval Limitation ... International House
- International Humanist and Ethical Union ... International Rapids
- International Red Cross ... International Years of the Quiet Sun
- International Young Men’s Christian Association Training School ... Interrogation II
- Interrogation of the Old Men, The ... Inti Cusi Huallpa Huáscar
- Inti-Illimani ... Introducing Dorothy Dandridge
- Introductio in analysin infinitorum ... Invasion USA
- Invasion, L’ ... investment, marginal efficiency of
- Investors Overseas Services ... Ion
- Ion ... IoT
- Iouernia ... Ipomedon
- Ipomoea ... Iranian Revolution
- Iranon ... Irigaray, Luce
- Irigoyen, Hipólito ... Irminfrid
- Irminger Current ... Ironton
- Ironweed ... Irwin, Bill
- Irwin, Bindi ... Isabella of Hainaut
- Isabella of Portugal ... Isfahan school
- Iṣfahānī, al- ... Isis Unveiled
- Isis, River ... Islamic Republic of Pakistan
- Islamic Republican Party ... ISM
- Ismael’s Ghosts ... Isola Farnese
- Isola Maddalena ... isotope dilution
- isotope effect ... Issy-les-Moulineaux
- Issyk-Kul ... It Is Never Too Late to Mend
- It Matters to Me ... Italian Mannerism
- Italian Masters in German Galleries ... Item, Villa
- Iténez, Río ... Iuridae
- IUS ... Ivo of Chartres, Saint
- Ivogün, Maria ... Izhorskaya Zemlya
- Izium ... Iʿtimād al-Dawlah, tomb of