John H. Ainsworth (born September 21, 1940) is an American dairy farmer and Republican politician from Shawano County, Wisconsin. He served 16 years as a member of the Wisconsin State Assembly (1991–2007).
Born in Shawano County, Wisconsin, Ainsworth graduated from Shawano High School and worked most of his life as a dairy farmer. He was elected to the Wisconsin State Assembly in 1990, and served 8 terms, retiring in January 2007.
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