| Manoel Viana | |
| Official Name: | Municipality of Manoel Viana |
| Settlement Type: | Municipality |
| Pushpin Map: | Brazil |
| Pushpin Mapsize: | 250 |
| Pushpin Map Caption: | Location in Brazil |
| Coordinates: | -29.5892°N -55.4828°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Brazil |
| Subdivision Type1: | State |
| Subdivision Type2: | Mesoregion |
| Subdivision Name2: | Southwestern Rio Grande do Sul (Sudoeste Rio-Grandense) |
| Subdivision Type3: | Microregion |
| Subdivision Name3: | Campanha Ocidental |
| Leader Title: | Mayor |
| Established Title: | Founded |
| Established Date: | March 20, 1992 |
| Total Type: | Total |
| Area Total Km2: | 1,390.7 |
| Population As Of: | 2020 [1] |
| Population Total: | 7,307 |
| Population Density Km2: | auto |
| Population Demonym: | Vianense |
| Timezone: | BRT |
| Utc Offset: | -3 |
| Postal Code Type: | Postal code |
| Postal Code: | 97640-000 |
| Area Code Type: | Area/distance code |
| Elevation M: | 113 |
| Blank Name: | HDI (2010) |
| Blank Info: | 0.655 – medium[2] |
Manoel Viana is a Brazilian municipality in the western part of the state of Rio Grande do Sul. It has a population of 7,307 (2020). Its elevation is 113 m. It has an area of 1,390.7 square kilometers making it one of the largest municipalities in the state. It is located 590 km west of the state capital of Porto Alegre and east of Alegrete. It is the only municipality that is by the Ibicuí River.