Isinai (also spelled Isinay) is a Northern Luzon language primarily spoken in Nueva Vizcaya province in the northern Philippines. By linguistic classification, it is more divergent from other South-Central Cordilleran languages, such as Kalinga, Itneg or Ifugao and Kankanaey. According to the Ethnologue, Isinai is spoken in Bambang, Dupax del Sur, and Aritao municipalities, alongside Ilocano.