William Fish

• William Fish (Scarborough MP), MP for Scarborough
• William Fish (musician), English violinist, organist and composer
• William H. Fish, Associate Justice and Chief Justice of the Supreme Court of Georgia
• William Fish (South African politician), Mayor of Cape Town
• W. B. Fisher, British geographer
• Will Fish, English footballer
• Billy Fish, fictional character in the 1975 film, ''The Man Who Would Be King''