- Dagenham 1918-
- Darlington 1832-
- Dartford 1885-
- Dartmouth 1660-1868
- Darwen 1885-1983
- Daventry 1918-
- Davyhulme 1983-1997
- Dearne Valley 1950-1983
- Delyn 1983-
- Denbigh 1918-1983
- Denbigh District of Boroughs 1660-1918
- Denbighshire 1660-1885
- Denbighshire Eastern 1885-1918
- Denbighshire Western 1885-1918
- Denton and Reddish 1983-
- Deptford 1885-1974
- Derby 1660-1950
- Derby North 1950-
- Derby South 1950-
- Derbyshire 1660-1832
- Derbyshire Eastern 1832-1885
- Derbyshire Mid 1885-1918
- Derbyshire North East 1950-
- Derbyshire North Eastern 1885-1950
- Derbyshire Northern 1832-1885
- Derbyshire South 1983-
- Derbyshire South East 1950-1983
- Derbyshire Southern 1832-1950
- Derbyshire West 1950-
- Derbyshire Western 1885-1950
- Devizes 1660-
- Devon East 1997-
- Devon Eastern 1868-1885
- Devon North 1950-
- Devon Northern 1832-1885
- Devon South West 1997-
- Devon Southern 1832-1885
- Devon West 1974-1983
- Devon West and Torridge 1983-
- Devonport 1832-1918
- Devonshire 1660-1832
- Dewsbury 1868-
- Don Valley 1918-
- Doncaster 1885-1983
- Doncaster Central 1983-
- Doncaster North 1983-
- Donegal 1802-1885
- Donegal East 1885-1922
- Donegal North 1885-1922
- Donegal South 1885-1922
- Donegal West 1885-1922
- Dorchester 1660-1885
- Dorking 1950-1983
- Dorset 1660-1885
- Dorset Eastern 1885-1950
- Dorset Mid and Poole North 1997-
- Dorset North 1950-
- Dorset Northern 1885-1950
- Dorset South 1950-
- Dorset Southern 1885-1950
- Dorset West 1950-
- Dorset Western 1885-1950
- Dover 1983-
- Dover 1660-1974
- Dover and Deal 1974-1983
- Down 1922-1950
- Down 1832-1885
- Down East 1885-1922
- Down Mid 1918-1922
- Down North 1885-1922
- Down North 1950-
- Down South 1885-1922
- Down South 1950-
- Down West 1885-1922
- Downpatrick 1801-1885
- Downton 1660-1832
- Drogheda 1832-1885
- Droitwich 1660-1918
- Droylsden 1950-1955
- Dublin 1832-1885
- Dublin 1802-1885
- Dublin Clontarf 1918-1922
- Dublin College Green 1885-1922
- Dublin Harbour 1885-1922
- Dublin North 1885-1922
- Dublin Pembroke 1918-1922
- Dublin Rathmines 1918-1922
- Dublin South 1885-1922
- Dublin St James's 1918-1922
- Dublin St Michan's 1918-1922
- Dublin St Patrick's 1885-1922
- Dublin St Stephen's Green 1885-1922
- Dublin University 1832-1922
- Dudley 1832-1974
- Dudley East 1974-1997
- Dudley North 1997-
- Dudley South 1997-
- Dudley West 1974-1997
- Dulwich 1983-1997
- Dulwich and West Norwood 1997-
- Dumbarton 1983-2005
- Dumbarton District of Burghs 1918-1950
- Dumfries 1974-2005
- Dumfries District of Burghs 1708-1918
- Dumfries and Galloway 2005-
- Dumfriesshire 1708-1974
- Dumfriesshire, Clydesdale and Tweeddale 2005-
- Dunbartonshire 1708-1950
- Dunbartonshire Central 1974-1983
- Dunbartonshire East 2005-
- Dunbartonshire East 1950-1983
- Dunbartonshire West 2005-
- Dunbartonshire West 1950-1983
- Dundalk 1801-1885
- Dundee 1832-1950
- Dundee East 1950-
- Dundee West 1950-
- Dunfermline 1974-1983
- Dunfermline Burghs 1950-1974
- Dunfermline District of Burghs 1918-1950
- Dunfermline East 1983-2005
- Dunfermline West 1983-2005
- Dunfermline and West Fife 2005-
- Dungannon 1801-1885
- Dungarvan 1802-1885
- Dunwich 1660-1832
- Durham 1678-
- Durham County 1675-1832
- Durham Mid 1885-1918
- Durham North 1983-
- Durham North West 1950-
- Durham North Western 1885-1918
- Durham Northern 1832-1885
- Durham South Eastern 1885-1918
- Durham Southern 1832-1885
- Dysart Burghs 1708-1832
2,145 constituencies in total