William Milligan (disambiguation)

William Milligan (1821–1892) was a Scottish theologian.

William Milligan may also refer to:
 * William Lane Milligan (1795–1851), British military surgeon
 * William Milligan, Lord Milligan (1898–1975), Scottish politician and judge
 * Billy Milligan (1955–2014), American multiple personality
 * Billy Milligan (baseball) (1878–1928), American baseball player


 * ST1M (born 1986), Russian rapper also known as Billy Milligan