Castell y Gwynt (English: Castle of the Wind) is a top of Glyder Fach in Snowdonia, north-west Wales. It has the distinction of being the only 3000 ft Welsh summit classed as only a Nuttall, hence it is not included in the Welsh 3000s. It has a prominence of 15.7 m (51.5 ft), and was only included on the Nuttall's list after re-surveying in 2007. The top is more famous as a feature than a summit.

Castell y Gwynt and the "Cantilever Stone" featured in the 1981 film Dragonslayer.

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53°06′18″N 4°00′33″W/53.10491°N 4.00905°W/ 53.10491; -4.00905