Montpelier is a city in Harrison Township, Blackford County, in the U.S. state of Indiana. This small rural community, the county's first to be platted, was established by settlers from Vermont, and is named after Vermont's capital city of Montpelier.

Harrison Township is one of four townships in Blackford County, Indiana. As of the 2020 census, its population was 2,353 and it contained 1,155 housing units. The township was named after William Henry Harrison, hero of the Battle of Tippecanoe, former governor of the Indiana Territory, and ninth President of the United States.