| I-deas | I-DEAS |
| I.Q. | IQ |
| I.R.A. | IRA |
| I.V.A. | VAT |
| IA | IA |
| IAAF | International Association of Athletics Federations |
| Iacco | Iacchus |
| Iacinto | Hyacinth |
| Iaculo | Amphiptère |
| Iadi | Hyades |
| Iago | Iago |
| Iago ab Idwal | Iago ap Idwal |
| Iago ap Beli | Iago ap Beli |
| Iah | Iah |
| IAI Kfir | IAI Kfir |
| Iaido | Iaidō |
| Iain Banks | Iain Banks |
| Ialite | Opal |
| Ialoveni | Raionul Ialoveni |
| Ian Anderson | Ian Anderson |
| Ian Anderson Plays the Orchestral Jethro Tull | Ian Anderson Plays the Orchestral Jethro Tull |
| Ian Brown | Ian Brown |
| Ian Curtis | Ian Curtis |
| Ian Dury | Ian Dury |
| Ian Fleming | Ian Fleming |
| Ian Gillan | Ian Gillan |
| Ian Haugland | Ian Haugland |
| Ian Hill | Ian Hill |
| Ian Holm | Ian Holm |
| Ian McDiarmid | Ian McDiarmid |
| Ian McEwan | Ian McEwan |
| Ian McKellen | Ian McKellen |
| Ian Murdock | Ian Murdock |
| Ian Paice | Ian Paice |
| Ian Paisley | Ian Paisley |
| Ian Rush | Ian Rush |
| Ian Smith | Ian Smith |
| Ian Solo | Han Solo |
| Ian Somerhalder | Ian Somerhalder |
| Ian Thorpe | Ian Thorpe |
| Ianira | Ianira |
| Iannis Xenakis | Iannis Xenakis |
| Iapigi | Iapyges |
| IARC | International Agency for Research on Cancer |
| iarda | yard |
| iarovizzazione | vernalization |
| Iasione | Iasion |
| iato | diaeresis |
| Iatrogenesi | Iatrogenesis |
| Iattur | See es una calamidad |
| Iazigi | Iazyges |
| Iaşi | Iaşi |
| IB | IB |
| Ib-Seth | Set |
| Ibach | Ibach |
| Ibadan | Ibadan |
| Ibaditi | Ibadi |
| Ibagué | Ibagué |
| Iban Mayo | Iban Mayo |
| Iban Zubiaurre | Iban Zubiaurre |
| Ibanez | Ibanez |
| Ibar | Ibar River |
| Ibaraki | Ibaraki |
| Ibarrangelu | Ibarrangelu |
| Ibbenbüren | Ibbenbüren |
| Ibbi-Sin | Ibbi-Sin |
| Ibelin | Ibelin |
| Iberia | Iberia |
| Iberica | Iberian |
