Harrison Township is one of fourteen townships in Dearborn County, Indiana.

As of the 2010 census, its population was 3,204 and it contained 1,338 housing units.

[4] Harrison Township was organized in 1844.

[5] According to the 2010 census, the township has a total area of 17.26 square miles (44.7 km2), of which 16.99 square miles (44.0 km2) (or 98.44%) is land and 0.26 square miles (0.67 km2) (or 1.51%) is water.

[4] The township contains two cemeteries: Braysville and Harrison Hills.