Fan Nedd is a mountain in the Fforest Fawr area of the Brecon Beacons National Park in Wales.

[1] The hill is in the form of a broad flat-topped ridge whose summit lies at 663 m (2175 ft) and is crowned by a trig point.

The hill is drained to the west by a number of streams running into the Nedd Fechan river whilst to the east, rainwater spills into the upper reaches of the Afon Llia.

The hill is within the Fforest Fawr Geopark designated in 2005 in recognition of the area's geological heritage.

[2] The entire hill is designated as open country so walkers may wander at will though most prefer to follow a path which skirts the rim of the steep northern face between Bwlch y Duwynt to the west and the minor road between the villages of Ystradfellte and Heol Senni to the east.