| Islas Chafarinas | Islas Chafarinas |
| Islas Los Roques | Los Roques Archipelago |
| Isle | Isle River |
| Isle of Jura Single Malt | Isle of Jura Single Malt |
| Isle of Portland | Isle of Portland |
| Isle of Wight Festival | Isle of Wight Festival |
| Islington | London Borough of Islington |
| Islisberg | Islisberg |
| Ismael Falcón | Ismael Falcón |
| Ismael Hernández | Ismael Hernández |
| Ismael Urzaíz | Ismael Urzaiz |
| İsmail Cem | İsmail Cem İpekçi |
| Ismail Gaspirali | İsmail Gaspıralı |
| Ismail Haniya | Ismail Haniyeh |
| Ismail I | Ismail I |
| Ismail Kadare | Ismail Kadare |
| Ismail Khan | Ismail Khan |
| Ismail Samani Piek | Ismoil Somoni Peak |
| Ismailia | Ismaïlia |
| Ismailia SC | Ismaily SC |
| Ismaning | Ismaning |
| Ismaël | Ishmael |
| Isme | -ism |
| Ismene | Ismene |
| Ismenias | Ismenias |
| Ismet Inönü | İsmet İnönü |
| ISMN | International Standard Music Number |
| Isny im Allgäu | Isny im Allgäu |
| Iso | ISO |
| Iso-elektrisch focusseren | Isoelectric focusing |
| Iso-elektrisch punt | Isoelectric point |
| Isoamylacetaat | Isoamyl acetate |
| isobaar | isobar |
| Isobaar proces | Isobaric process |
| Isochoor proces | Isochoric process |
| Isochromosoom | Isochromosome |
| Isocrates | Isocrates |
| Isodynamische punten | Isodynamic point |
| Isoflavonen | Isoflavone |
| Isogonale verwantschap | Isogonal conjugate |
| Isojoki | Isojoki |
| Isokyrö | Isokyrö |
| Isola Comacina | Isola Comacina |
| Isola dei Pescatori | Isola dei Pescatori |
| Isola del Giglio | Giglio Island |
| Isola di San Michele | Isola di San Michele |
| Isolaat | Language isolate |
| isolatie | isolation |
| isolatie- | insulating |
| isolationisme | isolationism |
| isolator | insulator |
| isoleer- | insulating |
| isolement | isolation |
| isoleren | isolate |
| Isolerende taal | Analytic language |
| isolering | isolation |
| Isomeer | Isomer |
| Isometrische projectie | Isometric projection |
| Isona i Conca Dellà | Isona i Conca Dellà |
| Isone | Isone |
| Isonoe | Isonoe |
| Isopreen | Isoprene |
| Isoritmie | Isorhythm |
| Isorno | Isorno |
| Isoroku Yamamoto | Isoroku Yamamoto |
| Isostasie | Isostasy |
| isotherm | isotherm |
