Johnsonville is a small unincorporated community in Steuben Township, Warren County, in the U.S. state of Indiana.

[1] Johnsonville was platted July 8, 1874 by John R. Johnson, Senior, near Sumner Station.

[2] As of September 1875 there were said to be about 50 people living in the town; there were several businesses including a dry goods store and a tan yard that produced leather.

[3] The town also had a druggist, a doctor, a lawyer, a blacksmith, a grain dealer, a railway agent, a tinker, and a boarding-house.

The Norfolk Southern Railway passes southwest through Johnsonville on its way to Danville, Illinois.