| John Ainsworth | |
| Office: | Member of the Wisconsin State Assembly |
| Constituency: | 6th Assembly district |
| Term Start: | January 4, 1993 |
| Term End: | January 1, 2007 |
| Predecessor: | Rosemary Hinkfuss |
| Successor: | Gary Tauchen |
| Constituency1: | 4th Assembly district |
| Term Start1: | January 7, 1991 |
| Term End1: | January 4, 1993 |
| Predecessor1: | Cathy Zeuske |
| Successor1: | Mark A. Green |
| Party: | Republican |
| Birth Date: | 21 September 1940 |
| Birth Place: | Shawano County, Wisconsin, U.S. |
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.[1]
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