Sir John Denman Barlow, 2nd Baronet (15 June 1898 – 5 January 1986) was a British Conservative Party politician, and before that was a British Liberal Party member. Barlow was the son of Sir John Barlow, 1st Baronet, and his wife the Hon. Anna Maria Barlow, daughter of . He was educated at Leighton Park School in Reading along with his brother, Thomas, and numerous other well-known Quaker luminaries of the day.