William Cantwell (April 24, 1804 – November 20, 1886) was a merchant, land owner and political figure in Quebec. He represented Huntingdon (provincial electoral district), Huntingdon in the Legislative Assembly of Quebec from 1869 to 1872 as a Conservative Party of Quebec (historical), Conservative member. He was born in Troy, New York and was educated there. In 1829, he married Jane Ann Wilson. Cantwell was mayor of Franklin, Quebec, Franklin and was warden for Huntingdon County, Quebec, 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. He died at Franklin at the age of 82.

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* 1804 births 1886 deaths Conservative Party of Quebec MNAs Mayors of places in Quebec American emigrants to pre-Confederation Quebec People from Montérégie {{Quebec-mayor-stub