Cardiff North (Welsh: Gogledd Caerdydd) is a constituency^{[n 1]} represented in the House of Commons of the UK Parliament since 2017 by Anna McMorrin of the Labour Party.^{[n 2]}

The seat has been relative to others a marginal seat since 2001 as well as a swing seat as its winner's majority has not exceeded 8% of the vote since the 14.3% majority won in that year. The seat has changed political allegiance twice since that year.

The constituency is to retain its name and gain wards, 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.^[3]

This seat is the residential quarter of Wales' capital, over half of northern Cardiff consists of owner-occupied housing, with a higher number of a middle class population than other sections. Historically it has mainly elected Conservative MPs, but with new housing development Welsh Labour has overturned the nominal majority more recently, turning the seat into a national target swing-constituency. By 2004, the Conservatives held a majority of councillors within the district (13, against five Liberal Democrats, three independents and no Labour), but in the following 2005 general election Welsh Labour's Julie Morgan retained the seat but with a reduced majority.

BBC News political editor Nick Robinson profiled the constituency as part of the BBC's build-up to the 2010 general election:^[4] saying:

The Tories are hopeful of winning the seat, having topped the Euro poll not just here but in Wales as a whole. They have 13 councillors in this constituency as against Labour's none and the Lib Dems' five – even though in Cardiff as a whole, the Lib Dems control the city council. Labour hopes depend on stressing the independence and hard work of the local MP – Julie (wife of Rhodri) Morgan – and persuading those Lib Dems not to switch to the Tories.

Morgan stood again for Welsh Labour in 2010, whilst the Conservatives chose Jonathan Evans MEP, who had previously been the MP for Brecon and Radnor. Evans won by 194 votes.

In 2015, Labour attempted to take the seat back but new candidate, Craig Williams, took it with a majority of 2,137. Many had expected it to be very close run again. ^[who?] Labour retook the seat in 2017 on a 6.1% swing, producing a majority of 4,174; this was the first time in the seat's history it had voted for a Labour candidate in an election they did not win and the first time it elected an MP who is not a member of the largest party in the House of Commons since October 1974. In 2019, the seat bucked the trend by swinging to Labour despite their heavy defeat nationally.

1950–1974: The County Borough of Cardiff wards of Cathays, Central, Gabalfa, Penylan, and Plasnewydd.

1974–1983: The County Borough of Cardiff wards of Cathays, Central, Penylan, and Plasnewydd.

1983–2010: The City of Cardiff wards of Gabalfa, Heath, Lisvane and St Mellons, Llandaff North, Llanishen, Rhiwbina, and Whitchurch and Tongwynlais.

2010–2024: The Cardiff electoral divisions of Gabalfa, Heath, Lisvane, Llandaff North, Llanishen, Pontprennau and Old St Mellons, Rhiwbina, and Whitchurch and Tongwynlais.

2024-Present: The Cardiff electoral divisions of Gabalfa, Heath, Lisvane, Llandaff North, Llanishen, Pontprennau and Old St Mellons, Rhiwbina, and Whitchurch and Tongwynlais, along with the addition of Taffs Well (formerly in Pontypridd)

Cardiff City Centre was in this constituency from its creation in 1950 until 1983, since when it has been in Cardiff Central.

• Cardiff North (Senedd constituency)
• List of parliamentary constituencies in South Glamorgan
• Opinion polling for the next United Kingdom general election in individual constituencies
• List of parliamentary constituencies in Wales