World Factbook
- Iceland Sea
- Ifni (region; former name of part of Spanish West Africa)
- Inaccessible Island
- Ingushetia (region)
- Inhambane (region)
- Inini (former name for French Guiana)
- Inland Sea
- Inner Hebrides (islands)
- Inner Mongolia (region; also Nei Mongol)
- Ionian Islands
- Ionian Sea
- Irian Jaya (province)
- Irish Sea
- Iskenderun (region; formerly Alexandretta)
- Islamabad (capital)
- Island (local name for Iceland)
- Islas Malvinas (island group)
- Istanbul (city)
- Italia (local name for Italy)
- Italian Somaliland (former name for southern Somalia)
- Ittihad al-Imarat al-Arabiyah (local name for the United Arab Emirates)
- Iturup (island; see Etorofu)
- Ityop'iya (local name for Ethiopia)
- Ivory Coast (former name for Cote d'Ivoire)
- Iwo Jima (island)
- Izmir (region)