| Serra do Mar State Park | |
|---|---|
| Parque Estadual da Serra do Mar | |
 Bocaiuva do Sul in the Serra do Mar State Park | |
   | |
| Nearest city | Praia Grande, São Paulo |
| Coordinates | 23°58′05″S 46°39′00″W / 23.968°S 46.6499°W |
| Area | 332,000 hectares (820,000 acres) |
| Designation | State park |
| Created | 1977 |
| Administrator | Fundação Florestal |
The Serra do Mar State Park (Portuguese: Parque Estadual da Serra do Mar) is a state park in the state of São Paulo, Brazil. It covers 315,000 hectares (780,000 acres) of the Serra do Mar mountain range, and is one of the largest remaining areas of continuous Atlantic Forest. The State Park stretches from the border of Rio de Janeiro to Itariri in the southern part of São Paulo.