Hårteigen is a characteristic mountain in Hordaland, Norway. It sits on and is visible from most parts of Hardangervidda.
The peak of Hårteigen rises 480 meters above the surrounding plateau (1690 m above sea level).
The first element is from Norse hárr 'grey', the last element is related to the German verb zeigen 'show'. On the large and flat plateau of Hardangervidda this mountain was important for travellers to find the direction.