Paulínia is a municipality in the state of São Paulo in Brazil. It is part of the São Paulo Macrometropolis. The population is 100,128 (2016 est.) in an area of 138.78 km². The elevation is 590 m. It is known for hosting the Replan, the largest refinery of Petrobras.
The municipality was created in 1964 from a part of the municipality of Campinas.