| Official Name: | Municipality of Cananéia |
| Cananéia | |
| Settlement Type: | Municipality |
| Subdivision Type: | Country |
| Subdivision Name: |  Brazil |
| Subdivision Type1: | Region |
| Subdivision Name1: | Southeast |
| Subdivision Type2: | State |
| Leader Title: | Mayor |
| Leader Name: | Gabriel Guimarães (GUIMA) |
| Leader Party: | PV |
| Established Title: | Founded |
| Established Date: | 12 August 1531 |
| Area Total Km2: | 1242.010 |
| Population As Of: | 2020 |
| Population Total: | 12,541 |
| Population Footnotes: | [1] |
| Population Density Km2: | 11.4 |
| Timezone: | BRT |
| Utc Offset: | -3 |
| Coordinates: | -25.0147°N -47.9267°W |
| Elevation M: | 8 |
| Blank Name: | HDI (2010) |
| Blank Info: | 0.720 – high[2] |
Cananéia is the southernmost city in the state of São Paulo, Brazil, near where the Tordesilhas Line passed. The population in 2020 was 12,541 and its area is 1,242.010 km². The elevation is 8 m. The city of Cananéia is host to the Dr. João de Paiva Carvalho research base belonging to the Oceanographic Institute of the University of São Paulo.
Founded in 1531, Cananéia is considered by some to be the oldest city in Brazil (5 months before the foundation of São Vicente) but due to the lack of official documentation proving this fact, São Vicente is officially the oldest city in Brazil. The historic center of Cananéia still preserves the architectural styles adopted by the first houses from the colonial period to the end of the 19th century.
The municipality contains the Ilha do Cardoso State Park, created in 1962. It contains part of the Tupiniquins Ecological Station. It contains the Mandira Extractive Reserve, established in 2002. The municipality contains the Taquari Extractive Reserve, created in 2008. It contains the Ilha do Tumba Extractive Reserve, also created in 2008. It contains the Itapanhapima Sustainable Development Reserve, created at the same time.
In telecommunications, the city was served by Companhia de Telecomunicações do Estado de São Paulo until 1975, 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]