Donnellson is a village in Montgomery and Bond counties, Illinois, United States.

[4] The village's name honors Thomas Carson Donnell, an early settler.

Illinois Route 127 passes through the village center as Washington Street, leading north 9 miles (14 km) to Hillsboro, the Montgomery County seat, and south 11 miles (18 km) to Greenville, the Bond County seat.

According to the U.S. Census Bureau, Donnellson has a total area of 0.37 square miles (0.96 km2), all land.

35.71% of all households were made up of individuals, and 20.00% had someone living alone who was 65 years of age or older.