Marion Township is one of eleven townships in Jennings County, Indiana, United States.

As of the 2020 census, its population was 1,117 (representing no change from 2010[1]) and it contained 461 housing units.

[2] According to the 2010 census, the township has a total area of 33.02 square miles (85.5 km2), of which 32.99 square miles (85.4 km2) (or 99.91%) is land and 0.04 square miles (0.10 km2) (or 0.12%) is water.

[1] The streams of Brushy Fork, Crooked Creek, Sixmile Creek and Slate Creek run through this township.

The township contains two cemeteries: German and Keith.