William A. Kasten (born September 25, 1956) is a former member of the Wisconsin State Assembly.
Kasten was born in Wausau, Wisconsin. After graduating from high school in Mosinee, Wisconsin, Kasten attended the United States Naval Academy before transferring to the University of Wisconsin-Madison.
Kasten was elected to the Assembly in 1982 and re-elected in 1984. He is a Republican.