- i ... I Got You Babe
- I Greet You at the Beginning of a Great Career: The Selected Correspondence of Lawrence Ferlinghetti and Allen Ginsberg, 1955–1997 ... I Will Marry When I Want
- I Will Stand ... IAA
- IAAF ... Iberia, Líneas Aéreas de España
- Iberia: Spanish Travels and Reflections ... Ibn Gabirol
- Ibn Hāniʾ ... Ibrahim Prize for Achievement in African Leadership
- Ibrāhīm Quṭb Shāh ... Ice Giant World
- ice glass ... Ichan-Kala
- Ichazo, Oscar ... Ictalurus
- Ictalurus nebulosus ... ideal solution
- ideal speech situation ... Idiocracy
- Idiocranium russeli ... IEF
- Iemanjá, Festival of ... Igbira
- Igbirra ... Iguaçu, Rio
- Iguaçu, Saltos do ... Ike Eisenhower
- Ike no Taiga ... Île d’Ouessant
- Île de France ... Ill River
- Illa ... Illustrations of the Dynamical Theory of Gases
- Illustrations of the Huttonian Theory of the Earth ... image intensifier
- Image of a Society ... IMDb
- IMEMO ... immune interferon
- immune reaction ... Imperial Airways Ltd.
- Imperial Ancestors, Temple of the ... impingement wear
- implantable cardioverter defibrillator ... Imruʾ al-Qays
- Imruʾ al-Qays ... In My Father’s House: Africa in the Philosophy of Culture
- In My Time: A Personal and Political Memoir ... In the Life of Chris Gaines
- In the Line of Fire ... inboard motorboat
- inborn error of metabolism ... inclined screw conveyor
- inclining experiment ... incubus
- inculturation ... Independents, Union of
- Indes galantes, Les ... Indian crane
- Indian Creek Massacre ... Indian pipe
- Indian pitta ... Indic languages
- Indic writing systems ... indirect system
- indirect tax ... Indonesian language
- Indonesian languages ... indulto
- Indur ... Industrious Bee
- industry ... infectious enteritis
- infectious hepatitis ... influenza A subtype H2N2
- influenza A subtype H3N2 ... ING Groep NV
- ING Group NV ... inharmonicity
- inherent note pattern ... Inkangala
- Inkatha Freedom Party ... Inniskilling
- Innitzer, Theodor ... Inquiry into the Human Prospect, An
- Inquiry into the Monastic Life ... Inspector Clouseau
- Inspector Gadget ... instruction-level parallelism
- instructional media ... integrated magnitude
- integrated pest management ... intention tremor
- intentional base on balls ... intercropping
- Intercursus Magnus ... interlibrary lending
- Interlinear Glosses ... internal language
- Internal Macedonian Revolutionary Organization ... International Campaign to Abolish Nuclear Weapons
- International Campaign to Ban Landmines ... International Ellipsoid of Reference
- International Encyclopedia of Unified Science ... International Missionary Council
- International Monetary Fund ... International Surrealist Exhibition
- International System of Units ... internuncio
- interoceptor ... interstratification
- intersubjective ... intracrystalline gliding
- intractable problem ... introverted quatrain
- Intruder ... inverse probability
- inverse psoriasis ... Invitée, L’
- invocation ... ion-exchange resin
- ion–molecule reaction ... iPad
- Ipai ... Ipswich
- Ipswich ... Irazú Volcano
- Irazú Volcano National Park ... Irises
- Irish ... Iron Dome
- Iron Dream, The ... Irr! Grønt!
- Irra ... Is Fat Bob Dead Yet?
- Is it Possible? ... Isadora
- Isaeus ... Ishanavarman
- Isḥāq al-Mawṣilī ... Iskandar-nāmeh
- Iskandariyyah, Al- ... Islamic State
- Islamic State in Iraq and Syria ... Ismail, Shabnim
- Ismailia ... Isola Stromboli
- Isola Vulcano ... isotope geology
- isotope record ... ISSP Survey
- issue preclusion ... It Happened One Night
- It Happened One Night ... Italian kingdom
- Italian Labour Union ... itch mite
- itching ... Iufaa
- IUGS ... Ives, Charles Edward
- Ives, Frederic Eugene ... Izadī
- Izagweba ... Iʿtimād al-Dawlah, tomb of
