Newport Hundred was a hundred in the county of Buckinghamshire, England. It encompassed the north of the county, enclosed by the counties of Bedfordshire and Northamptonshire and the Buckinghamshire hundreds of Aylesbury and Buckingham. It was commonly known as "the three hundreds of Newport" because it amalgamated three earlier (11C) hundreds: Bonestou, Moulsoe and Siglelai. Its modern equivalent is the Borough of Milton Keynes, which covers almost exactly the same area.