Araçoiaba da Serra is a city in the state of São Paulo in Brazil. It is part of the Metropolitan Region of Sorocaba. The population is 34,776 in an area of 255.33 km². The elevation is 625 m. The name Araçoiaba comes from the Tupi language, meaning "hider of the sun". This name comes from a single mountain nearby that the natives noted hid the sun as it set in the area.