| Arfon |
Constituency of same name also existed 1885-1918. |
| Argyll |
|
| Argyll and Bute |
|
| Argyll, Bute and South Lochaber |
|
| Armagh [borough] |
|
| Armagh [county] |
Constituency of same name also existed 1922-1983. |
| Armagh [county] |
Constituency of same name also existed 1832-1885. |
| Armagh Mid |
|
| Armagh North |
|
| Armagh South |
|
| Arundel |
Constituency first used at the February General election of 1974 (28/02/1974). Constituency of same name also existed 1832-1868. |
| Arundel |
Constituency of same name also existed 1974ยน-1997. |
| Arundel and Shoreham |
Constituency first used at the February General election of 1974 (28/02/1974). Full name (in Craig 4) Sussex (West), Arundel and Shoreham |
| Arundel and South Downs |
|
| Ashburton |
Full name (in Craig 2) Devon, Ashburton |
| Ashfield |
Full name (in Craig 4) Nottinghamshire, Ashfield |
| Ashford |
Full name (in Craig 2,3,4) Kent, Ashford |
| Ashton-under-Lyne |
|
| Aston Manor |
|
| Athlone |
|
| Aylesbury |
Full name (in Craig 2,3,4) Buckinghamshire, Aylesbury |
| Ayr |
Full name (in Craig 4) Ayrshire and Bute, Ayr |
| Ayr, Carrick and Cumnock |
|
| Ayr District of Burghs |
|
| Ayrshire |
|