Nelsonville is a village in Portage County, Wisconsin, United States.

The community of Nelsonville began about 1855 when English immigrant Jerome Nelson built a six-foot-high dam spanning the Tomorrow River, with a sawmill across the river from where the flouring mill now stands.

After Nelson returned from the Civil War he added the flouring mill in 1868.

A post office was added in 1871, named Nelsonville for the mill owner.

By 1876 two other businesses were there: the Nelson & Loberg general store, and Peterson Boots and Shoes.

[6] At this point the community incorporated as a village, in part in an effort to remove saloons that the town of Amherst refused to outlaw.

The racial makeup of the village was 97.38% White, 1.05% Native American, and 1.57% from two or more races.