Troy Grove is a village in LaSalle County, Illinois, United States.

Troy Grove is notable as the birthplace of Wild Bill Hickok and Kate Austin.

The railroad is today owned and operated by Union Pacific to haul raw material from the active silica mines.

U.S. Route 52 passes through the north side of the village as North 37th Road; it leads northwest 8 miles (13 km) to Mendota and east 54 miles (87 km) to Joliet.

Interstate 39 passes 1.5 miles (2.4 km) east of the village, with access from Exit 66 (US 52).

According to the 2021 census gazetteer files, Troy Grove has a total area of 0.69 square miles (1.79 km2), all land.

22.50% of all households were made up of individuals, and 7.50% had someone living alone who was 65 years of age or older.