Kelleth is a hamlet in Cumbria, England, containing around a dozen houses and formerly a toy factory. It is approximately from Penrith. It is in the Lune Valley, is situated next to the River Lune and is at an altitude of . The oldest houses in the hamlet date as far back as the 17th century.
The hamlet has previously gone by the names "Kellath" and "Kellathe".
Kelleth is a rural hamlet and much of the land (more than 50%) is used for farming.
Situated on the outskirts of the hamlet are 3 disused limekilns.