William Cornish

• William Cornish , Australian legal scholar and academic
• William Robert Cornish, British physician
• William R. Cornish, member of the Legislative Assembly of Alberta
• William Cornysh, also spelt Cornish, English composer and dramatist
• Willie Cornish, American jazz musician
• William Crocker Cornish, co-founder of Cornish and Bruce, a railway contracting company in Victoria, Australia