Joan A. Ballweg is an American business owner and Republican politician from Green Lake County, Wisconsin. She is a member of the Wisconsin Senate, representing the 14th Senate district since 2021. She previously served eight terms in the Wisconsin State Assembly, from 2005 to 2021, and was mayor of Markesan, Wisconsin, from 1991 to 1997.

The One-Hundredth Wisconsin Legislature convened from January 3, 2011, through January 7, 2013, in regular session, though it adjourned for legislative activity on May 22, 2012. The legislature also held two special sessions and an extraordinary session during this legislative term.