Acaraí State Park, Nature reserve in São Francisco do Sul, Brazil.

Acaraí State Park is a 6,667-hectare state conservation unit on the coastal plain of São Francisco Island in São Francisco do Sul, Santa Catarina. It spans from 1 to 50 metres in altitude and includes the Tamboretes Archipelago. The park is divided into four zones: a tangible area open to public visitation, primitive and research zones, and an intangible zone where human entry is prohibited to keep flora, fauna and fish breeding grounds intact.

The park was created by state decree 3.517 of 23 September 2005, following a municipal commission set up by decree 109 in March 2002. The steelmaker Vega do Sul paid R$10,100,000 in environmental compensation to buy out over 1,000 small lots, with priority for the elderly, the seriously ill and long-standing residents. A 2007 paper proposed changing its category to a sustainable development reserve because of the traditional population living inside.

The park holds a sizeable population of traditional residents, and hunting, logging and fishing are permitted only for them. A 2007 paper argued the category should become a sustainable development reserve because of this population. Park staff give lectures in regional schools and take student groups on educational activities inside the park.

Visitors should plan their visits through the Institute of Environment website, which provides current information about conditions and access. It is helpful to check in advance to learn about opening hours and any permits needed.

The Tamboretes Archipelago, four islands within the park, is closed to visitors, and fishing and spearfishing are banned within 50 metres of the islands, but diving to watch the marine fauna is permitted. The islands serve as a breeding area for several bird species.