| Official Name: | Rosário Oeste |
| Settlement Type: | Municipality |
| Motto: | Nossa Terra, Nossa Gente (Our Land, Our People) |
| Pushpin Map: | Brazil |
| Pushpin Map Caption: | Localization in Brazil |
| Subdivision Type: | Country |
| Subdivision Name: |  Brazil |
| Subdivision Name1: | Center-West |
| Subdivision Type2: | State |
| Subdivision Name2: | Mato Grosso |
| Subdivision Type3: | Mesoregion |
| Subdivision Name3: | Centro-Sul Mato-Grossense |
| Leader Title: | Mayor |
| Leader Name: | Joao Balbino (PSB) |
| Established Title: | Founded |
| Established Date: | June 25, 1843 |
| Unit Pref: | Imperial |
| Area Total Km2: | 8,802.047 |
| Population As Of: | 2020 [1] |
| Population Total: | 17,054 |
| Population Density Km2: | 2.01 |
| Timezone: | AMT |
| Utc Offset: | -4 |
| Coordinates: | -14.8358°N -56.4278°W |
| Elevation M: | 192 |
| Blank Name: | Demonym |
| Blank Info: | rosariense |
Rosário Oeste is a municipality in the state of Mato Grosso in the Central-West Region of Brazil.[2] [3] [4] [5]
The municipality contains part of the Águas do Cuiabá Ecological Station, a fully protected conservation unit in the cerrado biome.