William Cargill may refer to:
William Cargill (Berwick MP) (1813–1894; William Walter Cargill), Conservative Party politician William Cargill (New Zealand politician) (1784–1860; William Walter Cargill), Scottish-born New Zealand settler and politician William Wallace Cargill (1844–1909), American business executive and founder of Cargill, Inc
See also Cargill (surname)