Mary Sidney (née Dudley), Lady Sidney (c. 1530–1535 – 9 August 1586) was a lady-in-waiting at the court of Elizabeth I, and the mother of Sir Philip Sidney and Mary Sidney Herbert, Countess of Pembroke. A daughter of John Dudley, Duke of Northumberland, she was marginally implicated in her father's attempt to place Lady Jane Grey on the English throne and affected by his attainder. Mary Dudley was one of Queen Elizabeth's most intimate confidantes during the early years of her reign.
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