Tŷ Gwyn (Welsh for "White" or "Blessed House") may refer to:
Tŷ Gwyn, a former monastic community near Whitesands Bay in Pembrokeshire with ties to SS. Patrick and David Tŷ Gwyn Tower at Barmouth in Gwynedd Tŷ Gwyn at Crossways in Monmouthshire, a producer of cider Tŷ Gwyn, the former name for Clydach in Swansea Tŷ Gwyn, an estate in Penylan, Cardiff Tygwyn railway station at Glan-y-wern in Gwynedd on the Cambrian Line Tŷ Gwyn on the Taf (Tŷ Gwyn ar Daf), the supposed site of the legendary Welsh parliament that produced the Laws of Hywel Dda Whitland (Hendy-gwyn, "Old White House") in Carmarthenshire, the present settlement there