Alyn and Deeside (Welsh: Alun a Glannau Dyfrdwy) is a parliamentary constituency[n 1] represented in the House of Commons of the Parliament of the United Kingdom (at Westminster).

[3] This Welsh seat on the English border is part of the industrial hinterland north of Wrexham and west of Chester, with large employers including Toyota, BAE and Airbus.

[4] The main population areas in the current seat include Shotton, Connah's Quay, Buckley, Hawarden and Caergwrle.

It was formerly known as East Flintshire until the 1983 boundary review, in which it was renamed after the Alyn and Deeside district created in 1974.

2010–2024: The Flintshire County electoral divisions of Aston, Broughton North East, Broughton South, Buckley Bistre East, Buckley Bistre West, Buckley Mountain, Buckley Pentrobin, Caergwrle, Connah's Quay Central, Connah's Quay Golftyn, Connah's Quay South, Connah's Quay Wepre, Ewloe, Hawarden, Higher Kinnerton, Hope, Llanfynydd, Mancot, Penyffordd, Queensferry, Saltney Mold Junction, Saltney Stonebridge, Sealand, Shotton East, Shotton Higher, Shotton West, and Treuddyn.