The Tya is a river located in the municipality of Tydal in Sør-Trøndelag county, Norway. The long river flows from the lake Stuggusjøen near Stugudalen and flows north to the village of Ås where it joins the Nea River. It is part of the Nea-Nidelvvassdraget river system.
Tya or TYA may refer to:
- Tya (unit), or thousands of years ago, a unit of time
- Tya (river), a river of Norway
- Tauya language, a language of Papua New Guinea