Jász may refer to:
*
Jász people
*
Jász language
*
Jász-Nagykun-Szolnok, a county in Hungary
*
Jász-Nagykun-Szolnok (former county), a county in the historical Kingdom of Hungary
*
Jászság (Jász), a historical and geographical region in Hungary
* ''Jász'', the
Hungarian name for Iaz village,
Obreja Commune, Caraş-Severin County, Romania
{{DEFAULTSORT:Jasz
ja:ヤース