Delyn is a constituency^[2] represented in the House of Commons of the UK Parliament since 2019 by Rob Roberts, who was elected as a Conservative, but currently sits as an Independent following sexual harassment allegations.^[3]

The Delyn Senedd constituency was created with the same boundaries in 1999 (as an Assembly constituency).

The constituency is set to be abolished, as part of the 2023 Periodic Review of Westminster constituencies and under the June 2023 final recommendations of the Boundary Commission for Wales for the next United Kingdom general election. Its wards is to be split between Alyn and Deeside, and Clwyd East.^[4]

The seat comprises the mostly industrial Deeside communities of Mostyn, Flint, Mold, Northop and Holywell.^[5] Residents are slightly less affluent than the UK average.^[6]

1983–1997: The Borough of Delyn, and the Borough of Rhuddlan wards of Meliden, Prestatyn Central, Prestatyn East, Prestatyn North, and Prestatyn South West.

1997–2010: The Borough of Delyn.

2010–present: The Flintshire electoral divisions of Argoed, Bagillt East, Bagillt West, Brynford, Caerwys, Cilcain, Ffynnongroyw, Flint Castle, Flint Coleshill, Flint Oakenholt, Flint Trelawney, Greenfield, Gronant, Gwernaffield, Gwernymynydd, Halkyn, Holywell Central, Holywell East, Holywell West, Leeswood, Mold Broncoed, Mold East, Mold South, Mold West, Mostyn, New Brighton, Northop, Northop Hall, Trelawnyd and Gwaenysgor, and Whitford.

The Delyn constituency was created in 1983 from the seats of Flintshire West and Flintshire East. It is normally inclined to elect Labour MPs, although the Conservatives won the seat in their 1983 and 1987 landslide elections, and regained it in 2019 when they won their biggest national majority since the 1980s. From 1983 to 1997, the constituency included Tory-leaning Prestatyn, which was then transferred to the Vale of Clwyd seat.

• Delyn (Senedd constituency)
• List of parliamentary constituencies in Clwyd
• List of parliamentary constituencies in Wales