Hart Crag is a Lake District fell of 823.1 m in Westmorland and Furness. Its drop of 51.2 m makes it a Hewitt but is short of the 150 m a Marilyn needs.
The key col is close by, only 0.3 km to the north-west at 771.9 m. Its nearest higher summit, Fairfield, is also the hill its key col leads to. The highest point is recorded as outcrop, not a cairn.