蒙蒂阿祖尔（葡萄牙语：Monte Azul）是巴西米纳斯吉拉斯州的一个市镇。总面积991.568平方公里，总人口22437人，人口密度22.6人/平方公里。

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Monte Azul is a municipality in the north of the state of Minas Gerais in Brazil. The population is 21,990 (2015 est.) in an area of 994 km². The elevation is 582 meters. It became a municipality in 1878. The postal code (CEP) is 39500-000.

Monte Azul is part of the statistical microregion of Janaúba. It is 627 km. from the state capital, Belo Horizonte and about 30 km. south of the state boundary with Bahia. It is connected by paved roads to the regional center of Janaúba to the south. It is on the Minas Gerais-Bahia railroad line, which last had passenger service in 1996.