Chwilog is a village in Eifionydd on the Llŷn Peninsula in the Welsh county of Gwynedd. It forms part of the community of Llanystumdwy. The name means 'abounding in beetles' and was perhaps transferred from an earlier name of the river (or a part of it).
The village is fairly linear, built up around the B4354 which crosses the peninsula to Boduan. The Afon Wen flows through the lower part of the village on its way to the sea at Afonwen, less than 1 mile (1.6 km) away.
Nearby is Lôn Goed, a wide tree-lined avenue created in the 18th century for transporting lime from the coast to the upland farms of Eifionydd. The track is no longer used for this purpose but is now popular with walkers.
Talhenbont Hall is a Grade II listed manor house. It was built in 1607 was once the home of William Vaughan. In 1642, the owner William Lloyd was arrested as a Royalist sympathiser as Cromwell’s men took over the Hall. In 1758 Talhenbont was the largest single owned piece of land in the district of Eifionydd. The estate was occupied by Sir Thomas Mostyn, the sixth baronet, from 1796. In 1884 the estate was split into sections to pay off debts that had crept up during the Napoleonic Wars. It is now operated as a holiday centre. 
Chwilog Primary School was opened in 1908 by Margaret Lloyd George, wife of David Lloyd George. The village was built around the railway station on the Caernarfonshire Railway Line situated at the centre of the village. Businesses in the village include a butcher's shop and a tractor company. There is also a post office and a pub, the Madryn Arms.
- Owen, H.W. & Morgan, R. 2007 Dictionary of the Place-names of Wales Gomer Press, Ceredigion
- "Talhenbont Hall".
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