Reisa National Park (Norwegian: Reisa nasjonalpark; Northern Sami: Ráissa álbmotlaš meahcci) is a national park in Nordreisa Municipality, Troms county, Norway. It was created by a royal order on November 28, 1986. The park is home to many types of wildlife. The rough-legged buzzard is the most common bird of prey in the area, but hikers might also see golden eagles, common kestrels, and gyrfalcons. Wolverines and Eurasian lynx live in the park and nearby mountains. The Sámi name for part of the gorge, Njállaávzi, means "Arctic fox gorge," suggesting that Arctic foxes lived there a long time ago. The largest predator in Norway, the brown bear, is sometimes seen in the park.

The Reisa River has carved a valley and a canyon (north of Imo) in the mountain plateau, creating the long, fertile valley called Reisadalen. Waterfalls flow into the valleys and gorges. One of the most impressive waterfalls is Mollisfossen, which is 269 meters (883 feet) tall.

For many years, the valley and surrounding mountains have been important for hunting, trapping animals, and fishing. Snares are still used sometimes to catch ptarmigan and willow grouse in the traditional way. Scots pine trees were used for building materials and to make tar. Many farms in the valley earned extra money by making tar, and this practice continued into the 20th century. Remains of many tar kilns can still be found in the area. The park and nearby lands provided grazing areas for semi-domesticated reindeer in spring, summer, and autumn. In winter, the reindeer in this region graze in Kautokeino Municipality, Finnmark county, which is south of the park. In summer, they move to the coast in the northwest.

The park is next to the Käsivarsi Wilderness Area in Finland.