Fellbarrow – Mosser Fell is a Lake District fell of 416 m in Cumberland. All four of its nearest neighbours are higher, up to Whiteside at 707 m.
The key col is close by, only 0.3 km to the south at 364.4 m. It is 219.3 m below the average height of the 114 register hills in Cumberland. Its nearest higher summit, Low Fell, is also the hill its key col leads to. The summit is marked by a trig point.