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The 1917 Henley by-election was a by-election in Henley caused by the death of Major Valentine Fleming during World War I. The Conservative candidate Robert Hermon-Hodge won the subsequent by-election on 20 June 1917. He was unopposed due to a War-time electoral pact.

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1911	February: Arfon Cambridge University Horncastle Westbury Forest of Dean March: North East Lanarkshire Brentford Bootle April: Haddingtonshire Cheltenham East Dorset May: Birmingham South Barnstaple June: Ross & Cromarty Brighton July: Kingston upon Hull Central Glasgow Tradeston St Augustine's West Ham North East Wicklow North East Cork East Cork Luton Wellington Bethnal Green South West August: Middleton September: Kilmarnock Burghs October: North Tyrone Keighley November: Bristol East Oldham South Somerset Hitchin December: North Ayrshire Govan
1912	January: Carmarthen District February: Edinburgh East Glasgow St Rollox March: Manchester South Hereford South East Essex Leominster Epsom April: Nottingham East Forest of Dean May: Hackney South North West Norfolk June: Hythe Holmfirth July: Ilkeston Hanley Crewe August: Manchester North West East Carmarthenshire September: Midlothian November: Taunton Bolton Bow & Bromley
1913	January: Flint Boroughs Londonderry City February: East Waterford East Antrim Chorley March: Houghton-le-Spring Kendal April: Shrewsbury Whitechapel May: Newmarket Altrincham June: Leix Wandsworth Dover Leicester July: St George's, Hanover Square August: Chesterfield November: North Cork Linlithgowshire Reading Keighley December: Wick Burghs South Lanarkshire
1914	January: North West Durham February: Wycombe Cork City Bethnal Green South West Poplar Leith Burghs April: Belfast East East Fife May: Great Grimsby North East Derbyshire Ipswich June: Brighton Oxford University July: Birmingham West East Worcestershire North Galway August: Swansea District West Wicklow September: Bolton The Hartlepools November: Londonderry City December: East Galway Tullamore Sheffield Attercliffe
1915	February: Norwich Swansea District Scarborough Shipley Howdenshire Thirsk & Malton Wigtownshire Chesterton Saffron Walden Liverpool Kirkdale Mid Antrim Maidstone March: Carmarthen Boroughs April: Mid Durham May: Kilmarnock Burghs June: Preston Dublin College Green North Tipperary Keighley July: Arfon Glasgow Central October: Dublin Harbour Appleby November: Heywood Uxbridge Cardiff Kingston St Helens St Austell Merthyr Tydfil Tiverton December: Cleveland
1916	January: Newington West St George's, Hanover Square Portsmouth North West Staffordshire Chesterton Bradford Central Mile End Rotherham February: Liverpool East Toxteth North Louth South Tyrone Bolton Chester Droitwich March: Cockermouth Hertford South Shields Harborough Hyde April: Wimbledon Dublin University Ossory May: Tewkesbury South Londonderry Widnes July: Berwickshire August: Bodmin Berwick-upon-Tweed Colne Valley Abingdon September: Mansfield October: North Ayrshire St Pancras West Winchester North Fermanagh November: West Cork December: Hornsey Ashton-under-Lyne Sheffield Hallam Whitechapel Derby Edinburgh & St Andrews Universities
1917	January: Inverness-shire February: North Roscommon Dublin University Rotherham Rossendale West Perthshire Tamworth March: Stockton Oxford April: Aberdeen South Belfast South Ealing May: South Longford Edinburgh South June: Epping Henley Liverpool Abercromby July: Belfast South Fulham South Dublin East Clare South Monmouthshire Cambridge Chesterton Dundee August: Edinburgh & St Andrews Universities Kilkenny City Norwich October: Dublin University Islington East Spalding Basingstoke November: Salford North North Armagh December: Wisbech Southampton
1918	January: Mid Armagh Prestwich February: South Armagh March: Waterford City Manchester South April: East Tyrone Tullamore Birmingham West Keighley May: Ross Exeter Newcastle-upon-Tyne Wansbeck June: Gravesend Bridgwater East Cavan Clapham July: Finsbury East Manchester North East Fareham East Grinstead August: Canterbury September: Banbury October: St George's, Hanover Square Bath Mid Norfolk Elgin Burghs South Shields Prestwich November: Wilton
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