William Cobb
William Cobb may refer to:
- William Cobb, 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, British photographer
- William T. Cobb, Governor of Maine, 1905–1909
- William Jelani Cobb, American author and educator
- William Montague Cobb, physical anthropologist
- William Cobb, a character on the American science fiction drama Eureka
- William Peyton Cobb, Secretary of State of Alabama
- Will D. Cobb, American lyricist and composer
- Willie Cobb, American baseball player
- Billy Cobb, English former footballer active in the 1960s
- William Cobb, a member of the Court of Owls.