Greenfield Township is one of eleven townships in LaGrange County, Indiana. As of the 2020 census, its population was 1,323 (up from 1,276 at 2010) and it contained 617 housing units.
Greenfield Township was established in 1832.
According to the 2010 census, the township has a total area of , of which (or 98.94%) is land and (or 1.06%) is water.