Donna Mummau Rozar (née Mummau; born February 9, 1950) is an American politician, businesswoman, and nurse. A Republican, she represents the 69th district of the Wisconsin State Assembly. The 69th assembly district comprises most of the city of Marshfield, along with rural eastern Clark County, northwest Wood County, and southwest Marathon County. She was elected in the 2020 general election. Rozar is also a member of the Wood County Board of Supervisors, serving since 2000.