Carnedd Llechwedd-llyfn is a subsidiary summit of Carnedd y Filiast on the border of Snowdonia National Park in Llandderfel, in Gwynedd.

The northern slopes of the peak lie in Ysbyty Ifan, in Conwy.

It is part of the Arenig mountain range, and rises from the shore of Llyn Celyn.

It is also a peak in an area of moorland known as the Migneint.

The views of northern Snowdonia are extensive.