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