Sportsmen
- Billy Cook (footballer born 1890) (1890–1974), English-born footballer who played for Sheffield United
- Willie Cook (footballer) (1906–1981), Scottish footballer
- Billy Cook (Northern Irish footballer) (1909–1992), footballer who played for Celtic and Everton
- Billy Cook (footballer born 1940), Scottish-born footballer who played for Australia
- Bill Cook (footballer born 1887), Australian rules footballer for Carlton Football Club
- William Cook (billiards player), World Champion of English billiards in the 19th century
- Bill Cook (1896–1986), ice hockey player in the Hockey Hall of Fame
- Billy Cook (jockey) (1910–1985), Australian jockey
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