Washington Township is one of thirteen townships in Washington County, Indiana, United States. As of the 2020 census, its population was 10,506 and it contained 4,662 housing units.
According to the 2010 census, the township has a total area of , of which (or 99.52%) is land and (or 0.48%) is water.
(This list is based on USGS data and may include former settlements.)
The township contains these fifteen cemeteries: Blue River Hicksite, Blue River Quaker Orthodox, Coggswell, Crown Hill, McKnight, Mt. Zion, New Philadelphia, Nicholson, Norris, Old Hebron, Paynter, Poor Farm, Stalker, Winslow and Wright.
Washington Township is served by the Salem-Washington Township Public Library.