Kayanza Province is one of the 18 provinces of Burundi. Its capital city is also called Kayanza centre.

Kayanza Province is in the center of northern Burundi, adjoining Rwanda to the north. It borders Cibitoke Province and Bubanza Province to the west, Muramvya Province and Gitega Province to the south, and Ngozi Province to the east. The western part of Kayanza Province is in the Mugamba natural region, and the eastern part in the Buyenzi natural region. Some parts of the south are in the Kirimiro natural region.

It is divided administratively into the following communes:

• Commune of Butaganzwa
• Commune of Gahombo
• Commune of Gatara
• Commune of Kabarore
• Commune of Kayanza
• Commune of Matongo
• Commune of Muhanga
• Commune of Muruta
• Commune of Rango

2°55′S 29°37′E / 2.917°S 29.617°E / -2.917; 29.617