| Name | Other Name | Family | Nativ Name | ISO6391 Code | ISO6392T Code | ISO6392B Code | ISO6393 Code | Notes |
|---|---|---|---|---|---|---|---|---|
| Tsonga | Niger–Congo | Xitsonga | ts | tso | tso | tso | ||
| Tonga (Tonga Islands) | Austronesian | Faka Tonga | to | ton | ton | ton | ||
| Tigrinya | Afro-Asiatic | ትግርኛ | ti | tir | tir | tir | ||
| Tibetan | Sino-Tibetan | བོད་ཡིག | bo | bod | tib | bod | also known as Standard Tibetan | |
| Thai | Tai–Kadai | ไทย | th | tha | tha | tha | ||
| Telugu | Dravidian | తెలుగు | te | tel | tel | tel | ||
| Tatar | Turkic | татар теле; tatar tele | tt | tat | tat | tat | ||
| Tamil | Dravidian | தமிழ் | ta | tam | tam | tam | ||
| Tajik | Indo-European | тоҷикӣ; toçikī; تاجیکی | tg | tgk | tgk | tgk | ||
| Tahitian | Austronesian | Reo Tahiti | ty | tah | tah | tah | One of the Reo Mā`ohi (languages of French Polynesia) |