William Perry may refer to:

Business

• William H. Perry (businessman) (1832–1906), American businessman and entrepreneur
• William Perry (Queensland businessman) (1835–1891), businessman and politician in Queensland, Australia

Politics and law

• William W. Perry (1834–?), Wisconsin state assemblyman
• William H. Perry (South Carolina politician) (1839–1902), U.S. Representative from South Carolina
• Sir William Perry (New Zealand politician) (1885–1968), member of the New Zealand Legislative Council
• William C. Perry (1900–1985), 34th Chief Justice of the Oregon Supreme Court
• William J. Perry (born 1927), American businessman and former Secretary of Defense
• William H. Perry III (born 1940), Missouri politician

Sports

• William Perry (boxer) (1819–1880), English boxer known as the "Tipton Slasher"
• William Perry (cricketer) (1830–1913), English cricketer
• William Perry (American football) (born 1962), nicknamed "The Refrigerator"

Others

• William F. Perry (1823–1901), Confederate brigadier general, first Alabama superintendent of public education, self-taught professor
• William Stevens Perry (1832–1898), American Protestant Episcopal bishop and educator
• William Perry (Scottish priest) (died 1948), Scottish Anglican priest
• William G. Perry (architect) (1883–1975), American architect
• W. J. Perry (William James Perry, 1887–1949), British cultural anthropologist
• William Haggin Perry (1910–1993), American racehorse breeder and owner
• William G. Perry (psychologist) (1913–1998), American developmental psychologist, son of the architect
• William P. Perry (born 1930), American composer and producer