8 February:Blaenau Gwent, Ebbw Vale South (2027). Carl Bainton (Labour, elected as Independent) has resigned.
Cheshire East, Crewe Central (2027). Anthony Critchley (Labour) has resigned.
Gwynedd, Criccieth (2027). Eirwyn Williams (Independent) has died.
West Northamptonshire, East Hunsbury & Shelfleys (2025). Suresh Patel (Conservative) has resigned.
15 February:Dacorum, Tring West & Rural (2027). John Mottershead (Liberal Democrat) has ceased to be a councillor.
East Hampshire, Four Marks & Medstead (2027). Joanna Nelson (Liberal Democrat) has resigned.
Kingston-upon-Hull, Avenue (2026). Marjorie Brabazon (Labour) has resigned.
Neath Port Talbot, Briton Ferry East (2027). Chris James (Independent) has ceased to be a councillor.
Neath Port Talbot, Rhos (2027). Marcia Spooner (Plaid Cymru) has died.
22 February:Buckinghamshire, Farnham Common & Burnham Beeches (2025). David Anthony (Conservative) has resigned.
Buckinghamshire, Hazlemere (2025). Ron Gaffney (Conservative) has died.
Derbyshire Dales, Bakewell (2027). Mark Wakeman (Conservative) has been removed from the list of councillors.
Derbyshire Dales, Norbury (2027). Tony Morley (Conservative) has died.
Folkestone & Hythe, Romney Marsh (2027). Liz Grant (Conservative) has resigned.
Milton Keynes, Loughton & Shenley (2027). Brigid McBride (Labour) has resigned.
Scottish Borders, Jedburgh & District (2027). Pam Brown (SNP) has resigned.
Wiltshire, Calne Chilvester & Abberd (2025). Tony Trotman (Conservative) has died.
29 February:East Riding of Yorkshire, Minster & Woodmansey (2027). Peter Astell (Liberal Democrat) has died.
East Riding of Yorkshire, Tranby (2027). Viv Padden (Liberal Democrat) has died.
Horsham, Henfield (2027). Malcolm Eastwood (Independent) has died.
Horsham, Southwater North (2027). Mike Wood (Liberal Democrat) has resigned.
Great Yarmouth, Central & Northgate (2027). Mike Smith-Clare (Labour) has been disqualified for non-attendance.
6 March:
Carmarthenshire, Elli (2027). John Jenkins (Independent) has resigned.
7 March:
Bridgend, Aberkenfig (2027). Ellie Richards (Plaid Cymru) has resigned.
Glasgow, Hillhead (2027). Hanzala Malik (Labour) has died.
Lewisham, Mayoral (2026). Damien Egan (Labour) has resigned.
Mid Devon, Upper Yeo Valley & Tawe (2027). Stewart Penny (Independent, elected as Conservative) has been removed from the list of councillors.
Known Vacancies where a byelection is expected:Angus, "Arbroath West, Letham & Friockheim" (2027). David Fairweather (Independent) has resigned.
Cambridgeshire, Yaxley & Farcet (2025). Mac Maguire (Conservative) has died.
Cornwall, "Looe West, Pelynt, Lansallos & Lanteglos" (2025). Edwina Hannaford (Liberal Democrat) has died.
Croydon, Woodside (2026). Mike Bonello (Labour) has resigned.
Ipswich, St John's (2026). Sophie Connelly (Labour) has died.
Lancaster, Carnforth & Millhead (2027). Paul Gardner (Labour) has died.
Lancaster, Castle (2027). Shelagh McGregor (Green) has ceased to be a councillor.
Neath Port Talbot, Neath East (2027). Sheila Penry (Labour) has died.
North Kesteven, Heckington Rural (2027). Stewart Ogden (Conservative) has resigned.
North Northamptonshire, Desborough (2025). Mike Tebbutt (Conservative) has died.
North Tyneside, Cullercoats (2024). Linda Arkley (Conservative) has died.
Orkney, Stromness & South Isles (2027). James Stockan (Independent) has resigned.
Somerset, Somerton (2027). Dean Ruddle (Liberal Democrat) has died.
Teignbridge, Ashburton & Buckfastleigh (2027). Huw Cox (Liberal Democrat) has died.
Waverley, Milford & Witley (2027). Andy Law (Liberal Democrat) has died.
Wiltshire, Cricklade & Latton (2025). Bob Jones (Liberal Democrat) has died.
Worcestershire, Evesham North West (2025). Peter Griffiths (Conservative) has died.
Known Vacancies where the six month rule applies and so a byelection will not be held:Barnsley, Darton East (2024). Mat Crisp (Liberal Democrat) has resigned.
Barnsley, Kingstone (2024). Pooja Ramchandani (Labour) has ceased to be a councillor.
Basildon, Billericay East (2027). David Dadds (Conservative) has ceased to be a councillor.
Calderdale, Illingworth & Mixenden (2024). Guy Beech (Conservative) has ceased to be a councillor.
Castle Point, Canvey Island North (2024). John Payne (Canvey Island Independent Party) has ceased to be a councillor.
Havant, Hart Plain (2024). Carly Scannell (Conservative) has ceased to be a councillor.
Newcastle-upon-Tyne, Lemington (2024). Jason Smith (Newcastle Independents) has resigned.
North Tyneside, Valley (2024). Carole Burdis (Labour) has died.
Pendle, Earby & Coates (2024). Rosemary Carroll (Conservative) has ceased to be a councillor.
Rossendale, Longholme (2024). Steve Hughes (Labour) has resigned.
Stroud, Nailsworth (2024). Norman Kay (Green) has died.