Sir John Jephson (died 6 May 1638) was an English soldier and politician who sat in the House of Commons between 1621 and 1625.
His career was damaged by his fierce opposition to George Villiers, 1st Duke of Buckingham, the prime Royal favourite.
His Puritan leanings were also felt to be a handicap, even by his friends, particularly since they were combined with fears of a Catholic conspiracy to kill the Royal Family, although admittedly such beliefs became common enough in the 1670s, during the Popish Plot.
He was not a popular man, and his death gave rise to a colourful local story that his soul had been carried off by the Devil.
During the English Civil War, the family were obliged to sell Froyle to cover their debts, and thereafter were increasingly associated with Ireland.