Mary Sidney (1561 – 1621) was a Countess of Pembroke.
Mary Sidney may also refer to:
- Mary Dudley, Lady Sidney (c. 1530–1535 – 1586)
- Lady Mary Wroth née Sidney (1587–1651/3), poet
Mary Sidney (1561 – 1621) was a Countess of Pembroke.
Mary Sidney may also refer to:
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