Parsa National Park is a protected area in the Inner Terai lowlands of south-central Nepal. Established in 1984 A.D, it covers an area of 637.37 km2 (246.09 sq mi) in the Parsa, Makwanpur and Bara districts and is the largest wildlife reserve in the country. A buffer zone declared in 2005 comprises 298.2 km2 (115.1 sq mi).
In altitude, it ranges from 435 m (1,427 ft) to 950 m (3,120 ft) in the Siwalik Hills. In 2015, the protected area has been extended by 128 km2(49 sq mi). In the north of the protected area, the Rapti River and Siwalik Hills form a natural boundary to human settlements. In the east, it extends up to the Hetauda– Birgunj highway. In the south, a forest road demarcates the boundary.
Adjacent to the west is Chitwan National Park together with the Tiger Reserve Valmiki National Park. Before being converted to a protected area, the region used to be a hunting ground of the ruling class. Parsa National Park before being converted to a protected area, the region used to be a hunting ground of the ruling class.