Rannerdale Knotts is a Lake District fell of 355 m in Cumberland. All four of its nearest neighbours are higher, up to Grasmoor at 851.6 m.
It sits below Whiteless Pike, only 1.5 km to the north-east and 305 m higher. Its key col leads to Grasmoor, not to its nearest higher summit, Lad Hows. Only four of the 242 hills profiled in England are lower. Its nearest higher summit, Lad Hows (426 m, 1.1 km north-east), is a listed top not profiled here. It is 280.3 m below the average height of the 114 register hills in Cumberland.