Northwest Township is one of ten townships in Orange County, Indiana, United States. As of the 2020 census, its population was 330 and it contained 183 housing units.
Northwest Township was named from its position in the northwestern corner of Orange County.
According to the 2010 census, the township has a total area of , of which (or 99.64%) is land and (or 0.36%) is water.
The township contains these three cemeteries: Faucett, Freeman and Miller.