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.
This article about a Republican Party member of the Wisconsin State Assembly born in the 1940s is a stub.