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
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