ISO 639-6, tāi-piáu giân-gí hō-miâ ê hō-bé – Pō͘-hūn 6: goân-choân hâm-kòa giân-gí piàn-khoán ê Alpha-4 hō-bé (Codes for the representation of names of languages — Part 6: Alpha-4 code for comprehensive coverage of language variants), sī ISO 639 hē-lia̍t tang-tiong thê-gī thê-gī ê kok-chè phiau-chún, khai-hoat-chiá sī ISO/TC 37/SC 2 (International Organization for Standardization, Technical Committee 37, Subcommittee 2: Terminographical and lexicographical working methods). Pún thò phiau-chún ēng 4-jī ê hō-bé lâi piáu-hiān giân-gí kap giân-gí ka-cho̍k ê piàn-khoán.

ISO 639-6 sī 2009 nî hoat-piáu--ê, m̄-koh tī 2014 nî koh hō͘ chú-koán tan-ūi thiu-thè.