Ynys Môn (UK Parliament constituency)

Ynys Môn
County constituency for the House of Commons
Boundary of Ynys Môn in Wales.
Preserved county	Gwynedd
Electorate	49,721 (December 2010)
Major settlements	Holyhead, Llangefni, Beaumaris
Current constituency
Created	1536
Member of parliament	Albert Owen (Labour)
Number of members	One
Overlaps
Welsh Assembly	Ynys Môn, North Wales
European Parliament constituency	Wales

Coordinates: 53°15′54″N 4°21′47″W / 53.265°N 4.363°W / 53.265; -4.363

Ynys Môn (Welsh pronunciation: [ˌənɨs ˈmoːn]; officially called Anglesey until 1983) is a constituency of the House of Commons of the Parliament of the United Kingdom. It elects one Member of Parliament (MP) by the first past the post system of election.

The Ynys Môn Welsh Assembly constituency was created with the same boundaries in 1999.

The Laws in Wales Act 1535 (26 Hen. VIII, c. 26) provided for a single county seat in the House of Commons for each of twelve historic Welsh counties (including Anglesey) and two for Monmouthshire. Using the modern year, starting on 1 January, these parliamentary constituencies were authorised in 1536.

The Act contains the following provision, which had the effect of enfranchising the shire of Anglesey:

And that for this present Parliament, and all other Parliaments to be holden and kept for this Realm, one Knight shall be chosen and elected to the same Parliaments for every of the Shires of Brecknock, Radnor, Mountgomery and Denbigh, and for every other Shire within the said Country of Dominion of Wales;