| Lanarkshire North |
|
| Lanarkshire North Eastern |
|
| Lanarkshire Northern |
Constituency of same name also existed 1868-1885. |
| Lanarkshire Northern |
Constituency of same name also existed 1918-1950. |
| Lanarkshire North Western |
|
| Lanarkshire Southern |
|
| Lancashire North Eastern |
|
| Lancashire Northern |
|
| Lancashire South Eastern |
|
| Lancashire Southern |
|
| Lancashire South Western |
|
| Lancashire West |
|
| Lancaster |
Full name (in Craig 2,3,4) Lancashire, Lancaster. Constituency of same name also existed 1832-1868. |
| Lancaster |
Disenfranchised for corruption after 1865 General Election. Constituency of same name also existed 1885-1997. |
| Lancaster and Fleetwood |
Replaced Lancaster and Wyre, following creation of Wyre and Preston North |
| Lancaster and Wyre |
|
| Lancaster and Wyre |
|
| Langbaurgh |
|
| Launceston |
Full name (in Craig 2) Cornwall, Launceston |
| Leeds |
|
| Leeds Central |
Constituency of same name reformed in 1983. |
| Leeds Central |
Constituency of same name also existed 1885-1955. |
| Leeds Central and Headingley |
|
| Leeds East |
Constituency of same name reformed 1955. |
| Leeds East |
Constituency of same name also existed 1885-1918. |