Johnson Township is one of ten townships in Gibson County, Indiana. As of the 2020 census, its population was 4,467 (up from 4,094 at 2010) and it contained 1,814 housing units.
Johnson Township was organized in 1823.
According to the 2010 census, the township has a total area of , of which (or 99.73%) is land and (or 0.27%) is water.
The township contains four cemeteries: Nobles, Powell, Stunkel, Tabor and Williams.
Johnson Township is served by the South Gibson School Corporation.