Marion Township is one of thirteen townships in Jasper County, Indiana, United States. As of the 2020 census, its population was 6,648 (down from 7,571 at 2010) and it contained 2,522 housing units.
Charles Halleck Student Center, Hugh and Leona Rank House, and Schwietermann Hall were listed on the National Register of Historic Places in 2016.
According to the 2010 census, the township has a total area of , of which (or 99.87%) is land and (or 0.11%) is water.
The township contains three cemeteries: Crockett, Mount Calvary and Weston.
Marion Township residents are eligible to obtain a free library card from the Jasper County Public Library.