The Gorontalo–Mongondow languages are a group of Philippine languages

Philippine languages

The Philippine languages are a 1991 proposal by Robert Blust that all the languages of the Philippines and northern Sulawesi—except Sama–Bajaw and a few languages of Palawan—form a subfamily of Austronesian languages...

 spoken in northern Sulawesi

Sulawesi

Sulawesi is one of the four larger Sunda Islands of Indonesia and is situated between Borneo and the Maluku Islands. In Indonesia, only Sumatra, Borneo, and Papua are larger in territory, and only Java and Sumatra have larger Indonesian populations.- Etymology :The Portuguese were the first to...

, Indonesia.

The languages are,

• Gorontalic: Bolango, Buol
  Buol language
  Buol is a Philippine language spoken in North-eastern Sulawesi, Indonesia.-Phonology:Vowels are . Stress falls on penultimate syllable, with sequence of like vowels counting as one syllable. Consonants are:...
  
  , Bintauna, Gorontalo
  Gorontalo language
  The Gorontalo language is a Philippine language spoken in Gorontalo Province by the Gorontalo people. There is no ISO 639-1 code for Gorontalo. Dialects of Gorontalo are East Gorontalo, Gorontalo Kota, Tilamuta, Suwawa, and West Gorontalo...
  
  , Kaidipang, Lolak, Suwawa
• Mongondowic: Mongondow, Ponosakan

Adelaar and Himmelmann (2005) place Gorontalo in a Greater Central Philippine family. However, a 2008 analysis of the Austronesian Basic Vocabulary Database supports Gorontalo as the family most closely related to the Philippine languages, but outside the Philippine languages proper.