Serra da Concórdia State Park, State park in Rio de Janeiro, Brazil

Serra da Concórdia State Park covers 5,952 hectares across Valença and Barra do Piraí, in Rio de Janeiro's middle Paraíba do Sul valley. Its terrain runs from 400 to 1,059 metres, with secondary Atlantic Forest in a mosaic of regeneration stages; more than half the dominant trees are deciduous. The Morro do Cruzeiro is the highest point, and the Córrego Bonsucesso, Ipiabas and Ronco D'água waterfalls lie within the park.

The park was created by state decree 32.577 on 30 December 2002, initially covering 804.41 hectares between Valença and Barra do Piraí. Decree 45.766 of 28 September 2016 enlarged it to 5,952.11 hectares, adding Morro do Cruzeiro and the Córrego Bonsucesso, Ipiabas and Ronco D'água waterfalls.

The forest holds local importance as a protected refuge for rare species and as a place where researchers study the diversity of Atlantic Forest ecosystems. Visitors can observe conservation work and understand why this forest matters to the region.

Visitors should bring sturdy footwear and waterproof clothing since trails and conditions vary by season. It is best reached by car, and you should plan time for hiking or activities like canoeing.

The park's 2016 enlargement added Morro do Cruzeiro, the highest point of the Serra da Concórdia, together with the Córrego Bonsucesso, Ipiabas and Ronco D'água waterfalls. The decree of 28 September 2016 took the protected area from about 800 to almost 6,000 hectares.