The Aguirre State Forest (in Bosque Estatal de Aguirre) is a nature reserve on the south coast of Puerto Rico and one of the commonwealth's 20 state forests. It mainly consists of mangroves and floodplain forests, and it borders the Jobos Bay National Estuarine Research Reserve. The Aguirre State Forest is owned and administered by Puerto Rico. It was established in 1918 by Puerto Rico governor Arthur Yager to protect the mangrove forests areas between the municipalities of Guayama and Santa Isabel (Punta Petrona).
The forest is notable for its dense mangrove forests and salt ponds. As such it is an ecologically diverse area that is home to 13 species of reptiles, 4 species of amphibians and 3 species of bats. At least 184 bird species can be found within the forest and the area is an important bird nesting site. Some notable bird species found here are yellow-crowned night herons (Nyctanassa violacea), mangrove rails (Rallus longirostri