Plum Lake is a town in Vilas County, Wisconsin, United States.

The census-designated place of Sayner and the unincorporated community of Star Lake are located in the town.

The Town of Plum Lake is located in central Vilas County.

This section is often used as a through route for travellers crossing Vilas County as an alternative to STH 70.

CTH K runs east–west through the town serving the Star Lake area.