Notional results for a UK general election on 5 May 2005 Yorkshire and The Humber, England - Elections won by Labour
Figures presented for Labour include those candidates certified by both the Labour and the Co-operative parties.
| Constituency | Electorate | Turnout | Votes | Vote share | Majority |
| Barnsley Central | 64,774 | 47.7% | 17,805 | 57.6% | 11,839 |
| Barnsley East | 65,823 | 48.8% | 22,808 | 71.0% | 18,298 |
| Batley and Spen | 73,601 | 60.8% | 20,249 | 45.3% | 6,060 |
| Bradford East | 67,827 | 54.1% | 16,172 | 44.1% | 5,227 |
| Bradford South | 65,884 | 53.4% | 17,009 | 48.3% | 8,444 |
| Bradford West | 65,280 | 56.0% | 14,524 | 39.7% | 3,050 |
| Brigg and Goole | 65,365 | 62.7% | 18,795 | 45.8% | 3,217 |
| Calder Valley | 72,174 | 66.0% | 18,347 | 38.5% | 1,303 |
| Cleethorpes | 70,746 | 61.6% | 18,887 | 43.3% | 2,640 |
| Colne Valley | 77,264 | 65.3% | 17,862 | 35.4% | 1,267 |
| Dewsbury | 75,974 | 59.3% | 18,278 | 40.6% | 3,999 |
| Doncaster Central | 72,587 | 52.0% | 19,265 | 51.0% | 10,325 |
| Doncaster North | 71,750 | 52.6% | 19,300 | 51.1% | 12,027 |
| Don Valley | 71,877 | 53.3% | 21,674 | 56.5% | 11,333 |
| Elmet and Rothwell | 76,229 | 69.8% | 24,416 | 45.9% | 6,078 |
| Great Grimsby | 63,711 | 51.7% | 15,512 | 47.1% | 7,654 |
| Halifax | 65,179 | 61.0% | 16,658 | 41.9% | 3,481 |
| Hemsworth | 70,754 | 54.3% | 22,542 | 58.7% | 14,026 |
| Huddersfield | 62,462 | 56.6% | 16,402 | 46.4% | 7,883 |
| Keighley | 66,986 | 69.1% | 20,720 | 44.7% | 4,852 |
| Kingston upon Hull East | 68,805 | 47.6% | 18,361 | 56.1% | 11,740 |
| Kingston upon Hull North | 60,930 | 46.1% | 14,679 | 52.3% | 7,384 |
| Kingston upon Hull West and Hessle | 61,858 | 44.8% | 15,244 | 55.1% | 9,430 |
| Leeds Central | 76,713 | 44.3% | 20,236 | 59.5% | 12,916 |
| Leeds East | 63,823 | 56.1% | 21,423 | 59.8% | 13,689 |
| Leeds North East | 67,514 | 64.6% | 19,937 | 45.7% | 6,762 |
| Leeds West | 66,849 | 52.8% | 19,831 | 56.2% | 13,699 |
| Morley and Outwood | 70,788 | 58.5% | 19,024 | 46.0% | 8,669 |
| Normanton, Pontefract and Castleford | 79,310 | 53.3% | 27,630 | 65.3% | 20,608 |
| Penistone and Stocksbridge | 67,969 | 62.1% | 19,047 | 45.2% | 8,617 |
| Pudsey | 67,196 | 65.9% | 20,120 | 45.4% | 5,204 |
| Rotherham | 62,002 | 54.1% | 19,371 | 57.7% | 13,865 |
| Rother Valley | 70,370 | 57.7% | 20,929 | 51.6% | 11,558 |
| Scunthorpe | 62,875 | 54.4% | 17,815 | 52.0% | 8,638 |
| Sheffield, Brightside and Hillsborough | 66,476 | 50.0% | 23,126 | 69.6% | 18,801 |
| Sheffield Central | 60,400 | 55.0% | 15,463 | 46.5% | 5,025 |
| Sheffield, Heeley | 65,461 | 57.7% | 20,418 | 54.1% | 12,340 |
| Sheffield South East | 66,798 | 54.7% | 22,023 | 60.3% | 15,843 |
| Wakefield | 68,333 | 61.4% | 18,497 | 44.1% | 7,349 |
| Wentworth and Dearne | 70,879 | 54.4% | 23,810 | 61.8% | 17,551 |
| York Central | 65,817 | 60.6% | 19,490 | 48.8% | 10,344 |
Turnout as calculated by the House of Commons Library, is the total number of votes cast and not spoiled, divided by the size of the electorate.
Estimates of the 2005 general election result in new constituencies
Colin Rallings and Michael Thrasher, then at the University of Plymouth, produced estimates of the 2005 general election result as if the new constituencies recommended by the separate Parliamentary Boundary Commissions for England, Wales and Northern Ireland had then been in existence.
The Elections Centre, established by Professors Colin Rallings and Michael Thrasher, moved to the University of Exeter in 2003.