Grant Township is one of eleven townships in Benton County, Indiana. As of the 2020 census, its population was 1,085 and it contained 470 housing units. It was organized in December 1868 and was named for Ulysses Grant.
According to the 2020 census, the township has a total area of , of which (or 99.97%) is land and (or 0.03%) is water.
The township contains three cemeteries: Boswell, Perigo and Smith.