| Official Name: | Piraju |
| Settlement Type: | Municipality |
| Pushpin Map: | Brazil |
| Pushpin Map Caption: | Location in Brazil |
| Coordinates: | -23.1936°N -49.3839°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 |
| Leader Title: | Mayor |
| Area Total Km2: | 504.5 |
| Population Total: | 29,970 |
| Population As Of: | 2021 [1] |
| Population Density Km2: | auto |
| Timezone1: | BRT |
| Utc Offset1: | -3 |
| Postal Code Type: | Postal code |
| Area Code Type: | Area code |
Piraju is a municipality in the state of São Paulo in Brazil. The population is 29,970 (2021 est.) in an area of 504.5 km².[2] The elevation is 646 m. This place name comes from the Tupi language, meaning "yellow fish".
In telecommunications, the city was served by Companhia Telefônica Brasileira until 1973, when it began to be served by Telecomunicações de São Paulo.[3] 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).[4]