Sir Cornelius Wasterdyk Vermuyden (Sint-Maartensdijk, 1595 – London, 11 October 1677) was a Dutch engineer who introduced Dutch land reclamation methods to England. Commissioned by the Crown to drain Hatfield Chase in the Isle of Axholme, Lincolnshire, Vermuyden was knighted in 1629 for his work and became an English citizen in 1633.