William, Billy or Bill Grey may refer to:
British public figures William Grey (died 1551), MP for Reading William Grey, 13th Baron Grey de Wilton (died 1562), military commander Willam Grey (died 1574), MP for Bridgnorth William Grey, 1st Baron Grey of Werke (1593–1674), MP during 1621–22 Sir William Grey (governor) (1818–1878), Governor of Bengal 1866–1871, Governor of Jamaica 1874–1877 William Grey, 9th Earl of Stamford (1850–1910), scholar and philanthropist William Grey Walter (1910–1977), American-born neurophysiologist, cybernetician and robotician William G. Gray (1913–1992), ceremonial magician, Hermetic Qabalist and writer
Clergymen William Grey (bishop of Lincoln) (died 1436), also bishop of London William Grey (bishop of Ely) (died 1478), medieval English churchman William Henry Grey (1829–1888), African-American church leader and Reconstruction politician in Arkansas
Characters Bill Grey, Fox's dog friend in 1993's Star Fox General William Grey, General from the 1996 film Independence Day Billy Grey, motorcycle club president in 2009's Grand Theft Auto: The Lost and Damned
See also William Gray (disambiguation)