| Tày Tac | |
| States: | Vietnam |
| Speakers: | ? |
| Familycolor: | Kradai |
| Fam2: | Tai |
| Fam3: | Southwestern (Thai) |
| Fam4: | Chiang Saen |
| Iso3: | tyt |
| Glotto: | tayt1241 |
| Glottorefname: | Tay Tac |
| Script: | Latin script, Tai Viet script |
Tày Tấc (Tai Tâk) is a Southwestern Tai language spoken in Mường Tấc District (Muang Tâk), eastern Sơn La Province, Vietnam, where it is also referred to as White Tay.