The Cantanhez Forests National Park (in Portuguese: Parque Nacional das Florestas de Cantanhez) is a 1,057 km2 (408 sq mi)[1] national park in southern Guinea-Bissau, lying close to the international border with Guinea.

The site includes floodplain and mangrove habitats on the north-western bank of the upper Rio Cacine, as well as savanna and semi-humid tropical forest.

Tree vegetation is dominated by Afzelia africana, Alstonia congensis, Antiaris africana, Ceiba pentandra, Dialium guineense, Ficus spp.

[2] The park is home to a population of western chimpanzees which have been the subject of international studies, including that by Portuguese primatologist Claudia Sousa.

[3] The park has also been designated an Important Bird Area (IBA) by BirdLife International because it supports significant populations of a wide variety of bird species, including many waterbirds.