Tŷ Siamas is the "National Centre for Folk Music" in Wales, and is situated in Dolgellau.

The initiative to create such a centre was led by Ywain Myfyr (chairman and a founder of Sesiwn Fawr Dolgellau), and the project was managed by Mabon ap Gwynfor.

[1] The concept was "to establish a centre for music and cultural activities for the benefit of the community and visitors.

"[2] The site selected to accommodate the centre was the old market hall in the town, Neuadd Idris.

[1] It was named after an 18th-century harpist, Elis Sion Siamas, and initially housed an interactive exhibition, which allowed visitors to experience Welsh music, but this was closed down due to lack of interest.