Hamilton Township is one of nine townships in Sullivan County, Indiana, United States.

As of the 2020 census, its population was 7,143 and it contained 3,404 housing units.

[1] According to the 2010 census, the township has a total area of 60.91 square miles (157.8 km2), of which 59.58 square miles (154.3 km2) (or 97.82%) is land and 1.33 square miles (3.4 km2) (or 2.18%) is water.

[3] (This list is based on USGS data and may include former settlements.)