The Fellhorn () is a mountain in the "Allgäu Alps" near Oberstdorf, Germany, on the border with Austria. It is known for its fields of alpenroses (Rhododendron ferrugineum). According to Austrian sources the mountain is .
In 1972, a gondola lift, the "Fellhorn Lift", was built that runs up the mountain from the Stillach valley. Its top station is at 1,967 metres. There is also a lift connection to the Kanzelwandbahn. The cross-border Fellhorn/Kanzelwand Ski Region has 24 kilometres of slopes and 14 lifts.