Calvin Callahan (born March 2, 1999) is an American Republican politician. He serves as a member of the Wisconsin State Assembly, representing the 35th Assembly district. His district comprises Lincoln County, western Langlade County, and neighboring towns in Marathon, Oneida, and Shawano counties, in north-central Wisconsin. He also serves as a member of the Lincoln County Board of Supervisors, first elected in 2018, and a supervisor of the town of Wilson.