William Joseph Poupore
Member of the Canadian Parliament for Pontiac
In office 1896–1900
Preceded by	John Bryson
Succeeded by	Thomas Murray
Member of the Legislative Assembly of Quebec for Pontiac
In office 1882–1892
Preceded by	Thomas Bryson
Succeeded by	David Gillies
Personal details
Born	(1846-04-29)April 29, 1846 Allumette Island, Canada East
Died	August 17, 1918(1918-08-17) (aged 72) Westmount, Quebec, Canada
Political party	Conservative
Other political affiliations	Conservative Party of Quebec

William Joseph Poupore (April 29, 1846 – August 17, 1918) was a Canadian politician.

Born in Allumette Island, Canada East, the son of William Poupore and Susan McAdams, Poupore was educated on Allumette Island and at Ottawa College where he studied law for two years. He was a mill owner, contractor, and lumberer. In 1870, Poupore married his first cousin Eleonor, the daughter of John Poupore. He was mayor of Chichester from 1872 to 1882 and was warden of the county of Pontiac from 1881 to 1882. He was elected to the Legislative Assembly of Quebec for the electoral district of Pontiac in a by-election held in 1882. A Quebec Conservative, he was re-elected in 1886 and in 1890 by acclamation. He was defeated in 1892. He was elected to the House of Commons of Canada for the electoral district of Pontiac in the 1896 federal election. A Conservative, he did not run for reelection in 1900. Poupore died in Westmount at the age of 72 and was buried in the Notre Dame des Neiges Cemetery.