| Io | Io |
| Ioannis Georgiadis | Ioannis Georgiadis |
| Iocaste | Jokasta |
| iodine | jod |
| ion | ion |
| Ion Antonescu | Ion Antonescu |
| ion exchange | ionska izmenjava |
| ion exchanger | ionski izmenjevalec |
| Ion Ghica | Ion Ghica |
| Ion thruster | Ionski pogon |
| Ionia | Jonija |
| Ionian Islands | Jonija |
| Ionian Sea | Jonsko morje |
| Ionic bond | Ionska vez |
| ionising radiation | ionizirno sevanje |
| ionosphere | ionosfera |
| Iosif Stalin tank | IS |
| Iota | Jota |
| Iowa | Iowa |
| Iowa tribe | Iowa |
| IP | IP-naslov |
| IP address | IP-naslov |
| IP Code | IP-naslov |
| IPA | Mednarodna fonetična abeceda |
| IPod | IPod |
| IQ | IQ |
| IR | IR |
| Irak | Irak |
| Iran | Iran |
| Iran-Contra Affair | Irangate |
| Iran-Iraq War | Iransko-iraška vojna |
| Iranian Embassy Siege | Operacija Nimrod |
| Iraq | Irak |
| Iraq War | Zalivska vojna |
| Iraq-Iran War | Iransko-iraška vojna |
| Iraqi | Irak |
| Iraqi Republican Guard | Iraška republikanska garda |
| IRBM | MRBM |
| IRCnet | IRCnet |
| Ireland | Irska |
| Irenaeus | Sveti Irenej Lyonski |
| Ireneusz Jeleń | Ireneusz Jeleń |
| Iridium | Iridij |
| Iris | Šarenica |
| Iris oratoria | Šarenica |
| Irish | irščina |
| Irish euro coins | Irski evrokovanci |
| Irish Gaelic | irščina |
| Irish language | Irska gelščina |
| Irish people | Irci |
| Irish proverbs | Irski pregovori |
| Irish Republican Army | Irska republikanska armada |
| Irish Sea | Irsko morje |
| Irish stew | Irish stew |
| Irish vehicle registration plates | Registracijske oznake za cestna vozila v Sloveniji |
| Irishman | Irec |
| Irishwoman | Irka |
| IRIX | IRIX |
| iron | likati |
| Iron Age | Železna doba |
| iron and steel industry | železarstvo in jeklarstvo |
| Iron Cross | Železni križec |
| Iron Curtain | Železna zavesa |
| iron industry | črna metalurgija |
| Iron Maiden | Iron Maiden |
| Iron pyrites | Pirit |
| iron scrap | železni odpadki |
| Iron sulfate | Galica |
| ironwork industry | predelava železa in jekla |
| Irony | Ironija |
| Iroquois | Irokezi |
| irradiation | obsevanje |
| Irrational number | Iracionalno število |
