William Henry Allison (June 14, 1838 – December 15, 1934) was a Canadian politician and school lands commissioner. He was elected as a Conservative to the House of Commons of Canada in the 1878 election in the riding of Hants and re-elected in 1882. His brother David served as president of Mount Allison University. He died in Chamberlain, South Dakota in 1934, aged 96.