The Cross River National Park is a national park of Nigeria, located in Cross River State, Nigeria. There are two separate sections, Okwangwo (established 1991) and Oban (established 1988). The park has a total area of about 4,000 km2, most of which consists of primary moist tropical rainforests in the North and Central parts, with mangrove swamps on the coastal zones. Parts of the park belong to the Guinea-Congolian region, with a closed canopy and scattered emergent trees reaching 40 or 50 meters in height.
The park has one of the oldest rainforests in Africa, and has been identified as a biodiversity hot spot. Sixteen primate species have been recorded in the park. Rare primates include common chimpanzees, drills and (in Okwangwo) Cross River gorillas. Another primate, the gray-cheeked mangabey, seems to have recently been becoming extinct in the area.