Isabella FitzRoy, Duchess of Grafton

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Her Grace The Duchess of Grafton
1686 Oil painting of Isabella, Dutchess of Grafton by Willem Wissing
Personal details
Born	Isabella Bennet c. 1668
Died	7 February 1723
Spouses	Henry FitzRoy, 1st Duke of Grafton ​ ​ (m. 1672; died 1690)​ Sir Thomas Hanmer ​ (m. 1698)​
Children	Charles FitzRoy, 2nd Duke of Grafton
Parent(s)	Henry Bennet, 1st Earl of Arlington Elisabeth of Nassau

Isabella Bennet FitzRoy, Duchess of Grafton and later 2nd Countess of Arlington suo jure (c. 1668 – 7 February 1723), was a British peer and heiress.