Gainza is a fifth class municipality in the province of Camarines Sur, Philippines. According to the 2010 census, it has a population of 10,345 people, making it the least populous municipality in the province.

 

  Gainza is politically subdivided into 8 barangays:[2]

• Cagbunga

• Dahilig

• Loob

• Malbong

• Namuat

• Sampaloc

• District I (poblacion)

• District II (poblacion)