Sir John Austen, 1st Baronet (after 1673 – 22 March 1742), of Derehams, South Mimms, and Highgate, Middlesex. was a British landowner and Whig politician who sat in the English and British House of Commons between 1701 and 1727. Austen was the son of Thomas Austen, of South Mimms and Hoxton, by Arabella Forset, the daughter and heir of Edward Forset, of Ashford and Tyburn. His parents were married on 13 October 1673. He inherited the Manor of Tyburn, or Marylebone, from his mother's family and sold it in 1710 to John Holles, 1st Duke of Newcastle.