William Thomas Parry (May 17, 1837 – September 10, 1896) was a Welsh American immigrant, businessman, Republican politician, and Wisconsin pioneer.
He was a member of the Wisconsin State Senate and Assembly, representing Columbia County.
William T. Parry was born in Bangor, Gwynedd, in Wales, and received his basic education there.
He emigrated to the United States as a child in 1849, and settled in the town of Manchester, Wisconsin, which was then part of Marquette County.
He was elected to the Wisconsin State Assembly on the Republican Party ticket in 1880 and was re-elected in 1881.