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The 1904 Cork City by-election took place in Cork City (UK Parliament constituency) on 19 August 1904.

It followed the passage of the Land Purchase (Ireland) Act 1903, fought for by Cork MP William O'Brien of the Irish Parliamentary Party. In this he was opposed by his colleagues in the party for having achieved Land Reform before Home Rule. In disgust, O'Brien closed his newspaper the Irish People and resigned his seat on 1 January 1904. Eventually the writ was moved to fill the vacant seat and O'Brien was nominated.

William O'Brien was returned unopposed.

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1900	December: Dover Preston Guildford Wellington Woodbridge West Derbyshire Blackpool North Monaghan
1901	February: Stretford March: Maidstone May: Monmouth Boroughs Mid Cork Oswestry Saffron Walden June: Stratford-on-Avon July: Wokingham August: Andover September: North East Lanarkshire November: Galway
1902	January: Hampstead Dewsbury February: Sheffield Ecclesall East Down South Down North Kilkenny March: South Monaghan Wakefield April: West Donegal Woolwich May: Bury July: Leeds North August: Clitheroe Tiverton East Worcestershire Belfast South Sevenoaks October: Devonport November: Cleveland Liverpool East Toxteth Orkney and Shetland
1903	January: Newmarket Liverpool West Derby February: South Antrim East Perthshire Dublin University March: Galway Woolwich Rye North Fermanagh Chertsey April: Camborne May: Preston South Kildare July: Barnard Castle August: Argyllshire September: St Andrews Burghs Rochester October: North Leitrim South Meath Belfast West Warwick and Leamington Westhoughton Fareham Londonderry November: Chorley December: Dulwich Lewisham Ludlow
1904	January: Ashburton Norwich Gateshead Ayr Burghs February: City of London St Albans Birmingham South March: Normanton Rossendale East Dorset Dublin St Stephen's Green April: Isle of Wight June: West Cavan Harborough Devonport July: Sowerby Chertsey Oswestry August: Reading North East Lanarkshire Cork City October: Isle of Thanet November: West Monmouthshire Horsham
1905	January: Stalybridge Mile End North Dorset February: North Kildare Liverpool Everton March: Appleby Buteshire April: Brighton June: Whitby Chichester Cork North Donegal Finsbury East July: Kingswinford West Down Carlisle September: Elgin Burghs Belfast North October: Barkston Ash Hampstead November: Normanton December: New Forest
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