Kasiguranin (Casiguranin) is a Tagalogic language from the Casiguran town of Aurora in the northern Philippines. It is descended from an early Tagalog dialect that had borrowed heavily from Northeastern Luzon Agta languages, and, to a lesser extent, from Ilocano, Bikol languages, Kapampangan, Gaddang, Itawis, Ibanag, and Paranan, which were spoken by settlers from other parts of the Philippines.