William John McCart

William John McCart (August 7, 1872 – 1933) was an Ontario merchant and political figure. He represented Stormont in the Legislative Assembly of Ontario from 1902 to 1904 and from 1908 to 1911 as a Liberal member.

He was born in Port Henry, New York, the son of John McCart. He was educated in Brockville, Ontario. He was employed as a clerk with companies in Finch and Maxville, before establishing his own business in Maxville. He later opened a general store in Avonmore. McCart married Wilmena Steele in 1892. He was defeated in the 1905 election but was reelected in 1908. McCart later moved to Toronto where he established a wholesale business dealing in fruit. He drowned at Cornwall in 1933.