Càrn a' Mhàim is a Scottish mountain situated in the inner part of the Cairngorms range, some 15 kilometres west of Braemar in the county of Aberdeenshire.

The western flanks fall precipitously to the Lairig Ghru while the eastern slopes descent more gently to the valley of the Luibeg Burn.

To the north is a narrow two kilometre-long crest which is often labelled as the only noteworthy ridge in the Cairngorms; it connects the mountain to Ben Macdhui.

From there it is a hard climb of 500 metres up the side of the Allt Clach nan Tàillear (The Tailor's Burn) with much boulder-hopping to reach the summit plateau of Macdhui.

The ascent of Càrn a' Mhàim is most commonly started at the Linn of Dee car park (NO065901), and takes the track to Derry Lodge.