Louisa Thynne, Viscountess Weymouth was an English noblewoman. She was the second wife of Thomas Thynne, 2nd Viscount Weymouth. She was the daughter of John Carteret, 2nd Earl Granville, and his first wife, the former Frances Worsley.
- Citizenship
- Kingdom of Great Britain
- Born
- 1714
- Died
- December 25, 1736