Ainsworth is a town in Langlade County, Wisconsin in United States.

The town was founded in 1904, and was named for Thomas Ainsworth, a civil engineer who supervised the construction of the Wolf River Dam in 1869 for the Keshena Improvement Company.

Rolling Stone Lake and the west end of Pickerel Lake are in the northeast part of the town, draining via Pickerel Creek to the Wolf River north of Pearson.

The racial makeup of the town was 98.77% White, 0.18% Native American, 0.35% Pacific Islander, and 0.7% from two or more races.

25.1% of all households were made up of individuals, and 12.5% had someone living alone who was 65 years of age or older.