William C. Clendinneng (June 22, 1833 – June 21, 1907) was an Irish-born manufacturer and political figure in Quebec. He was the owner of the William Clendinneng & Son Company (Limited), one of Canada's most important foundries, in operation from 1868 to 1904. He represented Montréal division no. 4 in the Legislative Assembly of Quebec from 1890 to 1892 as a Conservative. After the Clendinneng foundry ceased operations in 1904, Clendinneng left Montreal. He died in Depew, New York at the age of 74 after being hit by a train. He is buried at the Mount Royal Cemetery, Montréal.