| idrosfera | hydrosphere |
| idrosolubile | water-soluble |
| Idrossiapatite | Hydroxylapatite |
| idrossido | hydroxide |
| idrossido di alluminio | aluminium hydroxide |
| Idrossido di bario | Barium hydroxide |
| Idrossido di sodio | Sodium hydroxide |
| Idrossilazione | Hydroxylation |
| idrostatica | hydrostatics |
| idroterapia | hydrotherapy |
| idrovolante | seaplane |
| Idrozincite | Hydrozincite |
| IDSL | ISDN Digital Subscriber Line |
| Idstein | Idstein |
| Idukki | Idukki |
| Idwal Foel ab Anarawd | Idwal Foel |
| Idwal Iwrch ap Cadwaladr | Idwal Iwrch |
| idìllico | idyllically |
| Iefte | Jephtha |
| iella | bad luck |
| iellato | unlucky person |
| Iempsale II | Hiempsal II |
| iena | hyena |
| Ieoh Ming Pei | I. M. Pei |
| Ierapetra | Ierapetra |
| Ieraticità | Majesty |
| ieri | yesterday |
| ieri notte | last night |
| Ieri sera | Yesternight |
| Ierocle | Hierocles |
| Ierocle di Alessandria | Hierocles of Alexandria |
| Ierodiacono | Hierodeacon |
| Ierogamia | Hieros gamos |
| Ieromonaco | Hieromonk |
| iettatore | hoodoo |
| Ieuaf ab Idwal | Ieuaf ap Idwal |
| Ievan Polkka | Ievan Polkka |
| IF Elfsborg | IF Elfsborg |
| IFAB | International Football Association Board |
| IFF | IFF |
| Iffeldorf | Iffeldorf |
| Iffezheim | Iffezheim |
| Iffwil | Iffwil |
| Ifigenia | Iphigeneia |
| Ifigenia in Aulide | Iphigeneia at Aulis |
| Ifigenia in Tauride | Iphigeneia in Tauris |
| Ifito | Iphitos |
| IFK Göteborg | IFK Göteborg |
| IFK Malmö | IFK Malmö |
| IFK Stoccolma | IFK Stockholm |
| Iframe | IFrame |
| Ifriqiya | Ifriqiya |
| Ifá | Ifá |
| Ifìcrate | Iphicrates |
| IG | IG |
| IG Farben | IG Farben |
| Igantzi | Igantzi |
| Igarka | Igarka |
| Igbo | Igbo people |
| Igby Goes Down | Igby Goes Down |
| Igea | Hygieia |
| Igensdorf | Igensdorf |
| Igersheim | Igersheim |
| Iggensbach | Iggensbach |
| Iggingen | Iggingen |
| Iggy Pop | Iggy Pop |
| igiene | sanitation |
| igiene alimentare | food hygiene |
| igiene del lavoro | occupational health |
| Igiene orale | Oral hygiene |
| igiene pubblica | public health |
