| District of Arroio do Só | |
| Other Name: | Arroio do Só, the 5th district of Santa Maria |
| Settlement Type: | District |
| Mapsize: | 250px |
| Coordinates: | -29.8174°N -53.6272°W |
| Subdivision Type: | Country |
| Subdivision Name: | Brazil |
| Subdivision Type1: | State |
| Subdivision Name1: | Rio Grande do Sul |
| Subdivision Type2: | Municipality/City |
| Subdivision Name2: | Santa Maria |
| Government Type: | Subprefecture |
| Governing Body: | Subprefect |
| Area Total Km2: | 159.30 |
| Area Total Sq Mi: | 61.51 |
| Elevation Footnotes: | [1] |
| Elevation Max M: | 150 |
| Elevation Max Ft: | 492 |
| Elevation Min M: | 41 |
| Elevation Min Ft: | 134 |
| Population Footnotes: | [2] |
| Population Total: | 944 |
| Population Rank: | 6th of 10 |
| Population Density Km2: | auto |
| Population Density Sq Mi: | auto |
| Population Urban: | 289 |
| Population Rural: | 655 |
| Blank Name Sec1: | Neighbourhoods |
| Blank Info Sec1: | 1 |
| Blank1 Name Sec1: | Adjacent districts |
| Blank1 Info Sec1: | Pains, Palma, Passo do Verde. |
| Website: | Official site of Santa Maria |
Arroio do Só[3] ("rivulet of the hermit") is a district of the municipality of Santa Maria, in the Brazilian state of Rio Grande do Sul. It is situated in the east portion of Santa Maria. The district's seat is located 36 km (22,37 miles) from Downtown Santa Maria, and, is situated closely to limit with the district of Palma and limits with the municipality of Restinga Seca.
The district of Arroio do Só owns an area of 159,30 km² that is equivalent to 8,89% of the municipality of Santa Maria that is 1791,65 km².
The district was created in 1886, in 1993 the district's name was changed to "Arroio do Sol" (Rivulet of the Sun), and, in 1998 its name came back to be Arroio do Só (Rivulet of the Hermit).
In 1950, Arroio do Só owned 460 km². In 1961 loses part of its territory to the district of Santa Flora and, in 1997, to district of Palma.[4]
The district limits with the districts of Pains, Palma, and, Passo do Verde, and, with the municipalities of Restinga Seca and Formigueiro.
The district of Arroio do Só is divided in the following bairros, that in English is equivalent to neighbourhoods: