William Cantwell (April 24, 1804 – November 20, 1886) was a merchant, land owner and political figure in Quebec.
He represented Huntingdon in the Legislative Assembly of Quebec from 1869 to 1872 as a Conservative member.
Cantwell was mayor of Franklin and was warden for Huntingdon County from 1858 to 1860.
Cantwell was elected to the Quebec assembly in an 1869 by-election held after Julius Scriver resigned his seat to run for a federal seat.
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