William Gregory may refer to:

• William Gregory (1625–1696), English MP for Hereford and Weobley, Speaker of the House of Commons
• William Gregory (died 1616), MP for Nottingham
• William Gregory (fl. 1406), MP for Guildford
• William Gregory (lord mayor) (c.1400–1467), lord mayor of London
• William Gregory (mayor) (1896–1970), mayor of Lower Hutt, New Zealand
• William Gregory (Rhode Island governor) (1849–1901), American governor
• William Henry Gregory (1817–1892), Anglo-Irish politician, MP for Dublin and County Galway
• William S. Gregory (1825–1887), mayor of Kansas City
• W. Voris Gregory (1877–1936), US congressman from Kentucky
• Ivey William Gregory, known as Bill, American politician from Georgia

• Bill Gregory (born 1949), former American football defensive lineman
• Robert Gregory (RFC officer) (William Robert Gregory, 1881–1918), Irish cricketer and artist

• Will Gregory (born 1959), British musician with Goldfrapp
• William Gregory (Carmelite) (fl. 1520), Scottish Carmelite
• William Gregory (chemist) (1803–1858), Scottish chemist
• William Gregory (Chief Justice), British jurist and first Chief Justice of Quebec
• William Gregory (civil servant) (1762–1840), Irish senior civil servant
• William D. Gregory (1825–1904), American clipper ship captain, later a Union Navy commander
• William G. Gregory (born 1957), NASA astronaut
• William King Gregory (1876–1970), American zoologist

• All pages with titles containing William Gregory

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