Craig Cwm Silyn is a Hewitt of 734 m in Gwynedd. It shares its height of 734 m with Rhobell Fawr, Fan Fawr and Long Side.
On the Hewitts height ladder it sits between Rhobell Fawr (734 m) and Fan Fawr (734 m). The database describes the top as a windshelter on ancient cairn.