Sir Maurice Denys (1516–1563) of Siston Court, near Bristol, Gloucestershire, and of St John's Street, Clerkenwell, Middlesex, was an English lawyer and property speculator during the Dissolution of the Monasteries, at which time he served as a "powerful figure at the Court of Augmentations". He served as a Member of Parliament for Malmesbury in Wiltshire and as Treasurer of Calais. He was the builder of Siston Court in Gloucestershire, which survives largely unaltered since his time. His excessive speculation and borrowing caused the ruination of the Siston branch of the Denys family.