Notional results for a UK general election on 5 May 2005 Yorkshire and The Humber, England - by party
| Party | Constituencies contested | Votes | Vote share | Constituencies won |
| Labour | 54 | 958,006 | 43.6% | 41 |
| Conservative | 54 | 640,553 | 29.1% | 9 |
| Liberal Democrat | 54 | 454,705 | 20.7% | 4 |
| British National Party | 35 | 60,989 | 2.8% | 0 |
| UK Independence Party | 28 | 32,291 | 1.5% | 0 |
| Green Party | 21 | 26,316 | 1.2% | 0 |
Estimates of the 2005 general election result in new constituencies
Professors Colin Rallings and Michael Thrasher, at The Elections Centre of the University of Exeter, 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.