John Newdigate (1600 – 29 November 1642) was an English politician who sat in the House of Commons from 1628 to 1629.
Newdigate was the eldest son of Sir John Newdigate of Arbury Hall, Chilvers Coton, Warwickshire and his wife Anne Fitton, eldest daughter of Sir Edward Fitton, 1st Baronet of Gawsworth in Cheshire. He was the brother of Sir Richard Newdigate, 1st Baronet. and succeeded his father in 1610, inheriting Arley Hall, which his financially embarrassed grandfather had accepted in exchange for the family seat at Harefield, Middlesex. He matriculated at Trinity College, Oxford on 6 November 1618, aged 18. He was a student of Gray's Inn and of the Inner Temple in 1620.
He was appointed High Sheriff of Warwickshire for 1625–26 and was a Justice of the Peace for the county from 1630 to 1636. In 1628, he was elected Member of Parliament for Liverpool and sat until 1629 when King Charles decided to rule without parliament for eleven years.
Newdigate died at the age of about 42 and was buried at Harefield. He had married Susanna, the daughter of Arnold Lulls of London. He had no children and left the mortgaged Arbury estate to his brother Richard, who subsequently prospered to the degree that he was able to buy back the family's Harefield seat.