Marion Township is one of nine townships in Pike County, Indiana, United States. As of the 2020 census, its population was 683 and it contained 297 housing units.
Marion Township was organized in 1857.
According to the 2010 census, the township has a total area of , of which (or 98.06%) is land and (or 1.94%) is water.
(This list is based on USGS data and may include former settlements.)
The township contains these six cemeteries: Beadles, Bruster Branch, Corn, Flat Creek, Hayes and Walnut Grove.