Wilhelmina Powlett, Duchess of Cleveland

Her Grace The Duchess of Cleveland
The Duchess of Cleveland in an 1883 portrait by Sir Lawrence Alma-Tadema. Bowes Museum, Barnard Castle, Durham
Born	Lady Catherine Lucy Wilhelmina Stanhope 1 June 1819
Died	18 May 1901(1901-05-18) (aged 81)
Other names	Lady Dalmeny Lady Harry Vane
Occupation(s)	Historian, genealogist
Spouses	Archibald Primrose, Lord Dalmeny ​ ​ (m. 1843; died 1851)​ Harry Powlett, 4th Duke of Cleveland ​ ​ (m. 1854; died 1891)​
Children	Archibald Primrose, 5th Earl of Rosebery
Parent(s)	Philip Henry Stanhope, 4th Earl Stanhope Hon. Catherine Lucy Smith

Catherine Lucy Wilhelmina Powlett, Duchess of Cleveland (née Stanhope; 1 June 1819 – 18 May 1901), also known as Lady Dalmeny and Lady Harry Vane, was an English historian and genealogist, best known for her 1889 work The Battle Abbey Roll with some Account of the Norman Lineages.