Bontddu (Welsh for 'black bridge') is a small settlement just east of Barmouth, near the town of Dolgellau in Gwynedd, Wales.

Bontddu consists of a small collection of dwellings, a former chapel and a pub called The Halfway House which closed many years ago and is now boarded up.

The settlement is notable as it is the location of Clogau St David's gold mine that traditionally supplies gold for royal wedding rings.

[1] In 1997 the tanks at Bontddu petrol station leaked which caused a fireball and evacuation.

[2] Local tourism information describes a popular walk in the area of Bontddu: