William Cornish

William Cornish may refer to:

• William Cornish (legal scholar) (1937–2022), Australian legal scholar and academic
• William Robert Cornish (1828–1896), British physician
• William R. Cornish (1890–1969), member of the Legislative Assembly of Alberta
• William Cornysh, also spelt Cornish (1465–1523), English composer and dramatist
• Willie Cornish (1875–1942), American jazz musician
• William Crocker Cornish, co-founder of Cornish and Bruce, a railway contracting company in Victoria, Australia