Mogi Guaçu is a municipality in the state of São Paulo in Brazil. The population is 153,033 (2020 est.) in an area of 813 km2 (314 sq mi). The city is at an average elevation of 591 m (1,939 ft) above sea level. Mogi Guaçu is a place name that probably originates from the Tupi language. It means "large river of snakes". The city was founded on April 9, 1877.
The municipality contains the 469 hectares (1,160 acres) Mogi-Guaçu Biological Reserve, a fully protected conservation area created in 1942.The Autódromo Velo Città is a motorsport racetrack opened in 2012, located 20 km (12 mi) northeast of the city of Mogi Guaçu.