William J. Austin (May 27, 1822 – April 30, 1904) was an American miller, farmer, and politician.
He served one term in the Wisconsin State Assembly, representing Monroe County.
Then, in 1851, Austin moved to the town of Leon, Monroe County, Wisconsin.
Austin owned a mill and merchandise store in Leon, Wisconsin.
This article about a Republican Party member of the Wisconsin State Assembly born in the 1820s is a stub.