Carnedd y Ddelw is a summit in the Carneddau mountains in north Wales, north-east of Foel-fras. It is the Nuttall top of Drum (Wales). Its eastern slopes are drained by the Afon Tafolog, a tributary of Afon Roe which flows through the village of Rowen before joining the River Conwy. It is also the final top on Carnedd Llewelyn's long northern spur. To the north-west is Tal y Fan, the most northerly 2000 ft mountain in the Carneddau and Wales.