| Name | Other Name | Family | Nativ Name | ISO6391 Code | ISO6392T Code | ISO6392B Code | ISO6393 Code | Notes |
|---|---|---|---|---|---|---|---|---|
| Tajik | Indo-European | тоҷикӣ; toçikī; تاجیکی | tg | tgk | tgk | tgk | ||
| Tagalog | Austronesian | Wikang Tagalog | tl | tgl | tgl | tgl | Note: Filipino (Pilipino) has the code [fil] | |
| Thai | Tai–Kadai | ไทย | th | tha | tha | tha | ||
| Tigrinya | Afro-Asiatic | ትግርኛ | ti | tir | tir | tir | ||
| Tonga (Tonga Islands) | Austronesian | Faka Tonga | to | ton | ton | ton | ||
| Tswana | Niger–Congo | Setswana | tn | tsn | tsn | tsn | ||
| Tsonga | Niger–Congo | Xitsonga | ts | tso | tso | tso | ||
| Turkmen | Turkic | Türkmen; Түркмен | tk | tuk | tuk | tuk | ||
| Turkish | Turkic | Türkçe | tr | tur | tur | tur | ||
| Twi | Niger–Congo | Twi | tw | twi | twi | twi | Covered by macrolanguage [ak/aka] |