Phong Nha is a township in Bo Trạch District, Quảng Bình Province, North Central Coast Region of Vietnam. The township was formerly the rural commune of Son Trach.
Phong Nha township is located by Son River and contains part of Phong Nha-Ke Bang National Park, a UNESCO‘s World Heritage Site. Tourist service facilities for this national park are located in this township. Phong Nha was a fierce battlefield during the Vietnam War. The local inhabitants live mainly on agriculture and tourism.