| Name | Other Name | Family | Nativ Name | ISO6391 Code | ISO6392T Code | ISO6392B Code | ISO6393 Code | Notes |
|---|---|---|---|---|---|---|---|---|
| Gaelic | Scottish Gaelic | Indo-European | Gàidhlig | gd | gla | gla | gla | |
| Irish | Indo-European | Gaeilge | ga | gle | gle | gle | ||
| Galician | Indo-European | Galego | gl | glg | glg | glg | ||
| Manx | Indo-European | Gaelg; Gailck | gv | glv | glv | glv | ||
| Guaraní | Tupian | Avañe'ẽ | gn | grn | grn | grn + 5 | macrolanguage | |
| Gujarati | Indo-European | ગુજરાતી | gu | guj | guj | guj | ||
| Haitian | Haitian Creole | Creole | Kreyòl ayisyen | ht | hat | hat | hat | |
| Hausa | Afro-Asiatic | (Hausa) هَوُسَ | ha | hau | hau | hau | ||
| Hebrew (modern) | Afro-Asiatic | עברית | he | heb | heb | heb | Changed in 1989 from original ISO 639:1988; iw | |
| Herero | Niger–Congo | Otjiherero | hz | her | her | her |