William Sykes

William or Bill Sykes may refer to:

• Bill Sykes (born 1948), Member for Benalla in the Victorian Parliament
• Bill Sykes (priest) (1939–2015), English chaplain and author
• William Sykes (convict) (1827–1891), convict transported to Western Australia
• William Sykes (priest) (1861–1930), Anglican clergyman
• William Sykes (businessman) (1852–1910), English manufacturer of sporting goods
• William Henry Sykes (1790–1872), Indian Army officer
• William Sykes (cricketer) (1823–1915), English clergyman and cricketer
• William Robert Sykes (1840–1917), British engineer from London
• William Stanley Sykes (1894–1961), British anaesthetist and crime writer
• Charles Henry Sykes (1882–1942), known as Bill, American cartoonist