| Name | Other Name | Family | Nativ Name | ISO6391 Code | ISO6392T Code | ISO6392B Code | ISO6393 Code | Notes |
|---|---|---|---|---|---|---|---|---|
| Italian | Indo-European | Italiano | it | ita | ita | ita | ||
| Icelandic | Indo-European | Íslenska | is | isl | ice | isl | ||
| Irish | Indo-European | Gaeilge | ga | gle | gle | gle | ||
| Faroese | Indo-European | føroyskt | fo | fao | fao | fao | ||
| Belarusian | Indo-European | беларуская мова | be | bel | bel | bel | ||
| Bengali | Indo-European | বাংলা | bn | ben | ben | ben | also known as Bangla | |
| Bihari languages | Indo-European | भोजपुरी | bh | bih | bih | collective language code for Bhojpuri; Magahi; and Maithili | ||
| Bosnian | Indo-European | bosanski jezik | bs | bos | bos | bos | ||
| Breton | Indo-European | brezhoneg | br | bre | bre | bre | ||
| Bulgarian | Indo-European | български език | bg | bul | bul | bul |