The 55th Assembly district of the Wisconsin is one of 99 districts in the Wisconsin State Assembly. Located in east-central Wisconsin, the district comprises most of Winnebago County and part of southern Outagamie County. It includes all of the city of Omro and the village of Winneconne, the portion of Fox Crossing west of the Fox River, and the southern quarter of the city of Oshkosh. The district is represented by Republican Nate Gustafson, since January 2023.