Leath
- Not to be confused with Leith or Lethe
Leath was one of the wards of the ancient county of Cumberland in north west England. Unlike most other English counties, Cumberland was divided into wards rather than hundreds.
The ward was bounded on the south by Westmorland, the north by Cumberland and Eskdale wards, the east by the counties of Northumberland and Durham and on the west by the wards of Allerdale above Derwent and Allerdale below Derwent.