William Cobb may refer to:
- William Cobb (designer), designer and engineer of rollercoasters
- William H. Cobb, politician and father of baseball player Ty Cobb
- William J. Cobb, best known as Happy Humphrey, the heaviest professional wrestler of all time
- William Cobb (photographer), British photographer
- William T. Cobb (1857–1937), Governor of Maine, 1905–1909
- William Jelani Cobb (born 1969), American author and educator
- William Montague Cobb (1906–1990), physical anthropologist
- William Cobb (Eureka character), a character on the American science fiction drama Eureka
- William Peyton Cobb (1880–1963), Secretary of State of Alabama
- Will D. Cobb (1876–1930), American lyricist and composer
- Willie Cobb (fl. 1908–1909), American baseball player
- Billy Cobb (born 1940), English former footballer active in the 1960s
- William Cobb, a member of the Court of Owls.
See also
- Bill Cobbs (1934–2024), American character actor
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