Ohlman is a village in Montgomery County, Illinois, United States.

The village is named for Michael Ohlman, a Civil War captain of a Mississippi River steamboat.

Hillsboro, the Montgomery county seat, is 21 miles (34 km) to the southwest via IL 16.

According to the U.S. Census Bureau, Ohlman has a total area of 0.32 square miles (0.83 km2), all land.<"CenPopGazetteer2022"/> The village drains northwest toward the South Fork of the Sangamon River, a tributary of the Illinois River.

The census of 2000 showed there were no people living in the village; a recount in 2004 issued a revised population of 148.