John Sayer Poulter was a British politician.
Born in Winchester, Poulter was the son of Edmund Poulter, the Prebendary of Winchester. John became a barrister, and served as commissory of the Bishop of Winchester in Surrey. He also served as a fellow of New College, Oxford.
Poulter stood as a Whig in Shaftesbury at the 1832 UK general election, winning the seat. He argued in favour of electoral reform, and shorter maximum periods between general elections. He held his seat until 1838, when he was removed on petition.