For São Vicente's main port, see Porto Grande, Cape Verde
Porto Grande (Portuguese: Grand Harbor) is a municipality located in the southeast of the state of Amapá in Brazil. Its population is 19,669 and its area is 4,425 km².
It has a tropical rainforest climate with a short dry season. The Annual Pineapple Festival is a popular tourist attraction.
The municipality contains 7.72% of the 2,369,400 hectares (5,855,000 acres) Amapá State Forest, a sustainable use conservation unit established in 2006.