Countess Blanche Lancaster of Derby
- Born: 25 Mar 1345, Bolingbroke Castle, Lincolnshire
- Marriage: Duke John Plantagenet of Lancaster (1st) on 19 May 1359 in Reading Abbey, Reading, Berkshire, England
- Died: 12 Sep 1369, Bolingbroke Castle, Lincolnshire aged 24
- Buried: St. Paul's Cathedral, London, England
 Noted events in her life were:
• Death, 12 Sep 1369, Bolingbroke Castle, Lincolnshire. Died of Bubonic Plague, the Black Death.
Blanche married Duke John Plantagenet of Lancaster (1st), son of King Edward III Plantagenet of England and Philippa of Hainault and Holland, on 19 May 1359 in Reading Abbey, Reading, Berkshire, England. (Duke John Plantagenet of Lancaster (1st) was born on 6 Mar 1340 in Ghent, died on 3 Feb 1399 and was buried in St. Paul's Cathedral, London, England.)
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