Tŷ Newydd is a historic house in Llanystumdwy, near Criccieth, in Gwynedd, north-west Wales. Since 1990 it has housed the National Writing Centre of Wales. The centre specialises in residential creative writing and retreats. The courses are in both the English and Welsh languages, and cover many genres, forms and styles. The centre also holds regular seminars and forums.

Llanystumdwy is a predominantly Welsh-speaking village, community and electoral ward on the Llŷn Peninsula in Wales. It lies in the traditional county of Caernarfonshire but is currently administered as part of the unitary authority of Gwynedd. It is not regarded as being part of Llŷn, but as belonging instead to the ancient commote of Eifionydd on the Cardigan Bay coast, where it has its own beach. The community includes the villages of Chwilog, Afon Wen, Llanarmon, and Llangybi, plus the hamlets of Rhoslan and Pencaenewydd.