William Rees Brock (February 14, 1836 – November 1, 1917) was a Canadian businessman and politician.

Born in Eramosa Township, Upper Canada, Brock was president of W. R. Brock Co., Limited which sold wholesale dry goods, woolens, and carpets.

He was elected to the House of Commons of Canada in the 1900 federal election for the electoral district of Toronto Centre.

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