Kathleen Agnes Kennedy
- Born: 20 Feb 1920
- Marriage: William John Robert Cavendish Marquess of Hartington on 6 May 1944
- Died: 13 May 1948, FRA aged 28
- Buried: St. Peter's, Edensor, DBY
 Cause of her death was Plane Crash.
Kathleen married William John Robert Cavendish Marquess of Hartington, son of Edward William Spencer Cavendish 10th. Duke of Devonshire. KG. MBE. TD. and Lady Mary Alice Gascoyne-Cecil, on 6 May 1944. (William John Robert Cavendish Marquess of Hartington was born on 10 Dec 1917 and died on 10 Sep 1944.)
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