Montgomery Township is one of the fifteen townships of Marion County, Ohio, United States. The 2020 census found 2,064 people in the township; 676 lived in the village of LaRue and 413 lived in the village of New Bloomington.

Marion County is a county located in the U.S. state of Ohio. As of the 2020 census, the population was 65,359. Its county seat is Marion. The county was created in 1820 and later organized in 1824. It is named for General Francis "The Swamp Fox" Marion, a South Carolinian officer in the Revolutionary War.