Trostville, Wisconsin was a rural hamlet and post office address around the junction of Lisbon Plank Road, South Fond du Lac Avenue, and Center Street, in Sections 14 and 15 of what was then the Town of Wauwatosa in Milwaukee County, Wisconsin, in the late 19th and very early 20th century. It was the site of a post office from 1892–1898.; as of 1895–1898, the post office was serviced three times a week. The postmaster was John Trost.