The 1940 City of Chester by-election was a by-election to the United Kingdom House of Commons for the constituency of City of Chester which occurred following the death of Sir Charles Cayzer. The by-election was unopposed being held by the Conservatives.

City of Chester by-election, March 1940
Party		Candidate	Votes	%	±%
	Conservative	Basil Nield	Unopposed	*N/A*	*N/A*
	Conservative hold

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1936	January: Combined Scottish Universities February: Ross and Cromarty March: Dunbartonshire Llanelli May: Peckham June: Lewes July: Derby Balham and Tooting East Grinstead October: Birmingham Erdington November: Clay Cross Preston Greenock
1937	February: St Pancras North Manchester Gorton Oxford University Richmond-upon-Thames March: Combined English Universities Tonbridge Farnham April: Stalybridge and Hyde Wandsworth Central Birmingham West May: York June: Glasgow Hillhead Buckingham Plymouth Drake Cheltenham Hemel Hempstead Holland with Boston Bewdley Ilford St Ives July: Kingston-upon-Thames Chertsey North Dorset September: Glasgow Springburn October: Islington North November: Hastings
1938	January: Farnworth February: Pontypridd Ipswich Combined Scottish Universities April: City of London Fulham West May: Lichfield Aylesbury June: West Derbyshire Stafford Barnsley July: Willesden East October: Oxford November: Dartford Walsall Bridgwater Doncaster Lewisham West Fylde December: Kinross and Western Perthshire
1939	January: East Norfolk February: Holderness Ripon March: Batley and Morley Kincardineshire and Western Aberdeenshire April: South Ayrshire May: Down Sheffield Hallam Westminster Abbey Birmingham Aston Southwark North Kennington July: Caerphilly Portsmouth South North Cornwall Hythe Monmouth Colne Valley August: Brecon and Radnorshire October: Fareham High Peak Clackmannanshire and East Stirlingshire Ormskirk Ashton-under-Lyne November: Macclesfield December: Streatham Stretford Wells
1940	February: Southampton City of London Swansea East Belfast East Southwark Central Silvertown Cambridge University March: Kettering City of Chester Leeds North East April: Argyllshire Lonsdale Battersea North Glasgow Pollok May: Brighton East Renfrewshire Middleton and Prestwich June: Spen Valley Newcastle North Bow and Bromley Croydon North Wandsworth Central Bournemouth July: Newcastle West Montrose Burghs Nottingham Central Rochdale Wansbeck August: Middlesbrough West Mitcham Heywood and Radcliffe September: Bolton Manchester Exchange Preston November: Queen's University of Belfast Aldershot Southampton December: Northampton Birmingham Edgbaston
1941	February: Doncaster South Dorset Petersfield Dunbartonshire March: Hitchin Bodmin Carmarthen April: Great Yarmouth West Bromwich Mansfield May: Birmingham King's Norton Hornsey June: West Dorset July: Greenock Edinburgh West Dudley Pontefract August: Berwick-upon-Tweed September: Scarborough and Whitby The Wrekin October: Lancaster November: Brighton Hampstead December: Harrow Edinburgh Central
1942	February: North East Derbyshire Keighley March: Nuneaton Manchester Gorton Newcastle-under-Lyme Wigan Grantham April: Tavistock Cardiff East Glasgow Cathcart Wallasey Rugby May: Putney Chichester June: Llandaff and Barry Maldon Windsor July: Salisbury Spennymoor August: Rothwell Whitechapel and St Georges Poplar South Sheffield Park October: Manchester Clayton Ince
1943	January: Hamilton University of Wales February: Belfast West Ashford Antrim Midlothian and Peebles King's Lynn Portsmouth North Bristol Central Watford April: Buckingham Eddisbury Daventry June: The Hartlepools Newark Birmingham Aston July: Burton-on-Trent August: Chippenham October: St Albans Peterborough November: Woolwich West December: Consett Darwen Acton
1944	January: Skipton February: Brighton West Derbyshire Kirkcaldy Burghs Sheffield Attercliffe Bury St Edmunds March: Camberwell North April: Clay Cross July: Manchester Rusholme September: Bilston October: Chelsea Berwick-upon-Tweed
1945	April: Motherwell Combined Scottish Universities Chelmsford Caernarvon Boroughs May: Middlesbrough West Neath Newport
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