Philip Sidney, 3rd Earl of Leicester

Philip Sidney, 3rd Earl of Leicester, (January 10, 1619 - March 6, 1698), was the son of Robert Sidney, 2nd Earl of Leicester, whose title he inherited in 1677.

Philip Sidney's mother was Dorothy Percy, daughter of Henry Percy, 9th Earl of Northumberland, and two of his brothers were notable: Algernon Sydney, a Parliamentarian "martyr", and Henry Sydney, 1st Earl of Romney. Like Algernon, Philip was a supporter of Parliament in the English Civil War, but did not follow the cause to the same treasonous extremes. In 1645, he married Lady Catherine Cecil, daughter of William Cecil, 2nd Earl of Salisbury. Their children were Dorothy and Robert; the latter succeeded to his father's earldom.