布恩扎省是刚果共和国南部的一个省份，首府马丁古（Madingou），北临莱库穆省，东邻普尔省，南毗刚果民主共和国，西接尼阿里省，面积12,266平方公里，下分10县和1市，1990年人口205,986，

Bouenza is a department of the Republic of the Congo in the southern part of the country. It borders the departments of Lékoumou, Niari, and Pool, and internationally, the Democratic Republic of the Congo. The regional capital is Madingou. Towns and cities include Loudima, Mouyondzi, Loutété and Nkayi.