| London University |
Non-geographic constituency. |
| Longford |
Constituency of same name also existed 1918-1922. |
| Longford |
Constituency of same name also existed 1832-1885. |
| Longford North |
|
| Longford South |
|
| Lonsdale |
Full name (in Craig 3) Lancashire, Lonsdale |
| Loughborough |
Full name (in Craig 2,3,4) Leicestershire, Loughborough |
| Louth and Horncastle |
|
| Louth [borough, Lincolnshire] |
Full name (in Craig 2,3,4) Lincolnshire and Rutlandshire (parts of Lindsey), Louth |
| Louth [county, Ireland] |
Constituency of same name also existed 1918-1922. |
| Louth [county, Ireland] |
Constituency of same name also existed 1832-1885. |
| Louth North [county, Ireland] |
|
| Louth South [county, Ireland] |
|
| Lowestoft |
Full name (in Craig 2,3,4) Suffolk, Lowestoft |
| Lowestoft |
|
| Ludlow |
Full name (in Craig 2,3,4) Shropshire, Ludlow |
| Luton |
Constituency first used at the February General election of 1974 (28/02/1974). Full name (in Craig 2,3) Bedfordshire, Luton |
| Luton East |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Luton North |
|
| Luton South |
|
| Luton South and South Bedfordshire |
|
| Luton West |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Lyme Regis |
|
| Lymington |
|
| Macclesfield |
Full name (in Craig 2,3,4) Cheshire, Macclesfield |