Llanfihangel-y-traethau ("St. Michael's on the Beaches") was a parish in Ardudwy, Gwynedd, north-west Wales centred on a church of the same name in the village of Ynys.

Today it is part of the Bro Ardudwy ministry area, which includes Harlech, a few miles (kilometres) to the southwest, and Barmouth.

[2] (The rivers Glaslyn and Dwyryd once met near Llanfihangel Church, then ran southwest to reach the sea at Harlech.

Seagoing vessels were built at Tŷ Gwyn Gamlas near Ynys before the shipyards of Porthmadog were developed.

Ellis Wynne of Lasynys Fawr, Rector of Llandanwg and author of Gweledigaethu'r Bardd Cwsg (Visions of the Sleeping Bard), was married in Llanfihangel-y-traethau in 1698.

A plan was also made to build a railway from quarries owned by Lord Newborough and others in Ffestiniog parish to the south end of the Traethmawr embankment.

[3] On 7 May 1858 the Ecclesiastical Commissioners for England proposed to constitute "a separate district for spiritual purposes out of the parishes of Llanfihangel-y-Traethau, Llandecwyn, and Llanfrothen, in the county of Merioneth and in the diocese of Bangor.

A sum of £5000 in 3% annuities had been donated by Louisa Jane Oakley, widow, of Plas Tanybwlch, to support the minister of the new district of Penrhyn once it had a parish for ecclesiastical purposes.

Today the parish is part of the Bro Ardudwy ministry area, which includes Harlech, a few miles (kilometres) to the southwest, and Barmouth.

The graveyard of the church of Llanfihangel-y-traethau has a carved stone about 6 feet (1.8 m) high, with a square cross-section of about 0.15 to 0.2 metres (6 in to 8 in) across.

[12] It has a 12th century inscription reading in Latin, after expanding abbreviations,[13] This means, "Here is the grave of Wleder mother of Hoedliw who first built this church in the reign of King Owain".