Sir William MacGregor Henderson FRS FRSE MRCVS (17 July 1913 – 29 November 2000) was a Scottish veterinary expert on foot and mouth disease. He was also President of the Zoological Society of London, 1984–1989. He was in charge of controlling foot and mouth disease in South America from 1957 to 1966. In his life he was generally called Gregor Henderson.