Kazabazua is a village and municipality in La Vallée-de-la-Gatineau Regional County Municipality, Quebec, Canada. The village is about halfway between Maniwaki and Hull at the intersection of Route 105 and Route 301, just west of the Gatineau River.

The village and municipality are named after the Kazabazua River which passes through it. Like many other First Nations names, Kazabazua has had many spellings in English, such as Kazaluzu, Kasubasua, Cazabasua, Cazibazouis, Cazebalzuac, Cajibajouis. This word comes from the Algonquin word kachibadjiwan, from kach ("hidden") and djiwan ("current"), hence it means "underground river". This name is a reflection of the local topography because the Kazabazua River disappears underground and resurfaces a few dozen metres downstream. The river then flows through rapids and passes under a natural stone bridge.

The communities of Kazabazua Station, Aylwin, and Aylwin Station are also located within the municipality.

The bedrock of the region Kazabazua is composed predominantly of marble dating from the Precambrian Era and represent metamorphic sedimentary rocks from the Grenville orogeny.

At the Kazabazua River, marble is calcitic and contains crystals of graphite and grossular garnet. The marble has been chemically and mechanically eroded by water from the river to form a karst stone bridge. The inclusion of gneiss in the marble illustrates erosion differential.

The Kazabazua Plain is a geomorphological phenomenon unique to Quebec. It is made up of metamorphic rocks which are covered with a network of ancient sand dunes and bogs within which many rare plant species and threatened species have been identified. The topography is the result of water and wind action since the withdrawal of the last glacier. After this withdrawal, the region was covered by the Champlain Sea, which left a layer of marine clay. When the sea level lowered, the area was submerged under a postglacial delta which deposited large volumes of sand.

This area is part of the Algonquin First Nation territory and has long been inhabited by that people.

Circa 1835, the area began to be settled and the community was originally called Hoganville, in memory of the first pioneers, the Hogan family, who were soon joined by the Gabie, Chamberlain, and Pritchard families.

In 1858, the Aylwin Township was formed, followed in 1862 by the township municipality with the same name. These were named after judge and politician Thomas Cushing Aylwin (1806–1871). Also in 1862, the local post office opened, named Kazubazua. As evidenced by Lovell's Gazetteer of 1873, the village itself also began to be popularly known as Kazubazua.

In 1932, the name was changed to Kazabazua and the municipality legally took this name in 1976. It is often shortened to "Kaz" by locals.

Historical census populations – Kazabazua

Year Pop. ±% 1976 577 —     1981 645 +11.8% 1986 656 +1.7% 1991 636 −3.0% 1996 759 +19.3%	Year Pop. ±% 2001 786 +3.6% 2006 839 +6.7% 2011 847 +1.0% 2016 945 +11.6% 2021 1,037 +9.7%
Source: Statistics Canada

Private dwellings occupied by usual residents (2021): 484 (total dwellings: 832)

Languages:

• English as first language: 42.3%
• French as first language: 53.4%
• English and French as first language: 3.7%

• List of anglophone communities in Quebec

• Official website
• Kazabazua page at MRC de La Vallée-de-la-Gatineau website