Blue River Township is one of nine townships in Hancock County, Indiana, United States. As of the 2010 census, its population was 1,417 and it contained 542 housing units.
Blue River was organized in 1828. It was named from the Blue River, once an important waterway for mills.
County Line Bridge was listed on the National Register of Historic Places in 1994.
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 streams of Dilly Creek and Nameless Creek run through this township.
(This list is based on USGS data and may include former settlements.)
The township contains three cemeteries: Gilboa, Haskett, and Westland Friends Church.