The Northern Cordilleran languages are a group of languages spoken in the Philippines. They are,

• Dumagat: Dumagat Agta, ?Paranan, ?Kasiguranin
• Cagayan Valley
  • Isnag
    Isnag language
    The Isnag language is a language spoken by around 55,000 Isnags of the Apayao Province in the Cordillera Administrative Region in the northern Philippines. Around 85% of Isnags are capable of reading the Isnag language...
    
    
  • Ibanag–Gaddang
    • Ibanagic: Atta, Ibanag
      Ibanag language
      The Ibanag language is spoken by up to 500,000 speakers in the Philippines, in the northeastern provinces of Isabela and Cagayan, especially in Tuguegarao City, Solana, Cabagan, and Ilagan and with overseas immigrants in countries located in the Middle East, UK and the U.S.A....
      
      , Itawit, Yogad
    • Gaddang–Cagayan (85%): Gaddang
      Gaddang Language
      The Gaddang language is spoken by up to 30,000 speakers in the Philippines, in the northeastern provinces of Nueva Vizcaya and Isabela and by overseas immigrants in countries located Asia, Australia, Canada, Europe, in the Middle East, UK and the U.S.A.. Most of the speakers can also speak...
      
      , Cagayan Aeta, Ga'dang
      Ga'dang language
      -External references:*...
      
      

A 2008 analysis of the Austronesian Basic Vocabulary Database' fully supported the unity of the Cagayan Valley languages, and the unity of the Northern Cordilleran languages at 95% confidence. There are numerous languages of the Aeta peoples scattered through the North Cordilleran family which were not included in the study.