Bangor City Council have given notice of a vacancy in the office of councillor for Deiniol ward on Bangor Council. It is understood that the seat has become vacant after one of the councillors, who is a student, has left the area to return home.

An election will be held to fill the vacancy if a request in writing for an election is sent to The Returning Officer, Gwynedd Council, Council Offices, Caernarfon, Gwynedd LL55 1SH by ten electors of the above ward within the period ending at 12 noon on Friday, 6 July, 2018.

In the absence of a request for an election, the vacancy will be filled by the City Council.

Deiniol is one of eight electoral wards in the city of Bangor. The ward covers the centre of the city including the High Street and Bangor Cathedral (dedicated to St Deiniol). Two councillors are elected to Bangor City Council and one county councillor to Gwynedd Council.

The ward population, according to the 2011 Census, was 1,839. In the May 2017 county council election Plaid Cymru regained the seat from Labour, having lost it in 2012.