Mariscal Nieto (Spanish mariscal marshal) is the largest of three provinces that make up the Moquegua Region of Peru. The capital of the province is the city of Moquegua.
Some of the highest mountains of the province are listed below:
The province is divided into six districts, which are:
The province is inhabited by indigenous citizens of Aymara and Quechua descent. Spanish, however, is the language which the majority of the population (79.51%) learnt to speak in childhood, 15.65% of the residents started speaking using the Aymara language and 4.45% using Quechua (2007 Peru Census).