Rachel Cavendish, Duchess of Devonshire (née Russell; 1674–1725) was a British noblewoman and the wife of William Cavendish, 2nd Duke of Devonshire.
Rachel Russell was born in 1674, the daughter of William Russell, Lord Russell and his wife Rachel (née Wriothesley). In 1683, Russell's father was executed for treason for his alleged role in the Rye House Plot.
In 1688, Russell married William Cavendish, Marquess of Hartington, heir apparent to the Dukedom of Devonshire. Under her courtesy title Marchioness of Hartington, Cavendish was made a Lady of the Bedchamber to Queen Anne in 1702. She died in 1725.
The Duke and Duchess of Devonshire had ten children:
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