Claude Dénéchau (March 8, 1768 – October 30, 1836) was a businessman and political figure in Lower Canada.
In 1800, he married Marianne-Josette, the daughter of seigneur Jacques-Hyacinthe Simon, dit Delorme.
In 1813, he leased the seigneury of Bellechasse from the nuns of the Hôpital Général of Quebec and settled at the manor house at Berthier.
He served as commissioner for the trial of small causes at Berthier and was also president of the Quebec Fire Society.
Dénéchau was a member of the freemasons and became provincial grand master for the districts of Quebec and Trois-Rivières in 1820.