William Bourchier, 9th Baron FitzWarin

William Bourchier (1407–1470) jure uxoris 9th Baron FitzWarin, was an English nobleman.

He was the second son of William Bourchier, 1st Count of Eu (c. 1374 – 1420) by his wife Anne of Gloucester, Countess of Stafford.

[2] His elder brother was Henry Bourchier, 1st Earl of Essex (1404 – 4 April 1483).

Their children included son and heir Fulk Bourchier, 10th Baron FitzWarin (died 1480) and Blanche Bourchier (died 4 January 1483),[2] who married Philip Beaumont (1432–1473), of Shirwell, Devon.

Dugdale quoted the will of his son Fulk Bourchier who bequeathed his body to be buried in the chapel of the Blessed Virgin at Bampton, near the grave of his mother, Lady Thomasine, and he willed that marble stones with inscriptions should be placed on his own grave and that of his father, Lord William, and his mother, Lady Thomasine.