| Arroio do Sal | |
| Settlement Type: | Municipality |
| Subdivision Type: | Country |
| Subdivision Name: | Brazil |
| Subdivision Type1: | State |
| Subdivision Name1: | Rio Grande do Sul |
| Subdivision Type2: | Mesoregion |
| Subdivision Name2: | Metropolitana de Porto Alegre |
| Subdivision Type3: | Microregion |
| Subdivision Name3: | Osório |
| Leader Title: | Mayor |
| Leader Name: | João Luiz da Rocha |
| Established Title: | Founded |
| Established Date: | April 22, 1988 |
| Area Total Km2: | 120.939 |
| Elevation M: | 6 |
| Population As Of: | 2020[1] |
| Population Total: | 10,279 |
| Population Density Km2: | auto |
| Coordinates: | -29.5508°N -49.8889°W |
| Timezone: | BRT |
| Utc Offset: | -3 |
| Website: | arroiodosal.rs.gov.br |
| Blank Name Sec1: | HDI |
| Blank Info Sec1: | 0.813 |
| Blank1 Name Sec1: | GDP |
| Blank1 Info Sec1: | R$ 54,357,000 |
| Blank2 Name Sec1: | GDP per capita |
| Blank2 Info Sec1: | R$8,140.00 |
Arroio do Sal is a municipality in the state of Rio Grande do Sul, Brazil. It is about 30 km south of Torres and 30 km north of Capão da Canoa, thus in about the northern half of the state's shoreline. It is 175 km from Porto Alegre, with which it is connected via BR 101 and BR 290.
Though the population is only about 10,000, during the summer tourism season the number of people increases to about 90,000. It includes 27 km of the Atlantic coast and has about 60 beaches.