Reinheimen National Park (Norwegian: Reinheimen nasjonalpark) is a national park in Norway that was created in 2006. The park covers a large protected mountain area of 1,969 square kilometers (760 square miles). It is located in Møre og Romsdal and Innlandet counties in Norway. The park includes parts of several towns, including Lesja, Skjåk, Vågå, Lom, Fjord, and Rauma. The park includes much of the Tafjordfjella mountain range and the reindeer habitat in the northern part of the Ottadalen valley.

Reinheimen National Park is one of the largest untouched wilderness areas in Western Norway. Many parts of the original alpine ecosystem, including wild reindeer, wolverines, golden eagles, gyr falcons, and ptarmigans, remain intact. The park has many mountains and valleys. The tallest mountains in the park rise more than 2,000 meters (6,600 feet) above sea level. The landscape in Reinheimen is very different in different areas. In the west, the land is very dramatic, with sharp peaks, narrow ridges, and fast-moving rivers. In the east, the land is more gently sloped, with plateaus, wider valleys, and slower-moving rivers. Several rivers, such as the Istra, Rauma, Lora, Finna/Skjerva, Valldøla, and Tora/Føysa, begin in Reinheimen.