Thornthwaite (disambiguation)
Thornthwaite is a village in Cumbria, England.
Thornthwaite may also refer to
- Thornthwaite, North Yorkshire, England
 - C. W. Thornthwaite (1899-1963), American geographer
 - Thornthwaite climate classification (Climate classification system created by American climatologist C. W. Thornthwaite)
 - Jane Thornthwaite, Canadian politician