The Campanha Ocidental micro-region (Microrregião de Campanha Ocidental, meaning the western fields in Portuguese) is a microregion in the western part of the state of Rio Grande do Sul, Brazil.

The area is 31,125.429 km2 making it the largest micro-region in the state nearly covering one-tenth of the entire state, much of the central and eastern portions remain underpopulated.

The microregion consists of the following municipalities:[1]

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