| Official Name: | São Lourenço da Serra |
| Settlement Type: | Municipality |
| Pushpin Map: | Brazil |
| Pushpin Map Caption: | Location in Brazil |
| Coordinates: | -23.8528°N -46.9428°W |
| Subdivision Type: | Country |
| Subdivision Name: | Brazil |
| Subdivision Type1: | Region |
| Subdivision Name1: | Southeast |
| Subdivision Type2: | State |
| Subdivision Name2: | São Paulo |
| Subdivision Type3: | Mesoregion |
| Subdivision Type4: | Microregion |
| Subdivision Type5: | Metrop. region |
| Subdivision Name5: | São Paulo |
| Leader Title: | Mayor |
| Area Total Km2: | 186.46 |
| Population Total: | 15,978 |
| Population As Of: | 2020 [1] |
| Population Density Km2: | auto |
| Timezone1: | BRT |
| Utc Offset1: | -3 |
| Postal Code Type: | Postal code |
| Postal Code: | 06890 |
| Area Code Type: | Area code |
| Area Code: | +55-11 |
São Lourenço da Serra (Portuguese for "Saint Lawrence of the mountain") is a suburban municipality in the southeastern part of the state of São Paulo in Brazil. It is part of the Metropolitan Region of São Paulo.[2] The population is 15,978 (2020 est.) in an area of 186.46 km2.[3] The southern part of the municipality is heavily forested with the Serra do Mar mountain range, the central and the northern parts are predominantly hilly and partially urbanized.
The neighborhood of Itapecerica da Serra became a separate municipality in 1991.
In telecommunications, the city was served by Companhia de Telecomunicações do Estado de São Paulo until 1973, when it began to be served by Telecomunicações de São Paulo.[4] In July 1998, this company was acquired by Telefónica, which adopted the Vivo brand in 2012.
The company is currently an operator of cell phones, fixed lines, internet (fiber optics/4G) and television (satellite and cable).[5]