Union Township is one of thirteen townships in Tippecanoe County, Indiana, United States. As of the 2010 census, its population was 1,610 and it contained 675 housing units.
According to the 2010 census, the township has a total area of , of which (or 99.16%) is land and (or 0.84%) is water. The township and the town of Shadeland share the same borders.
The township contains these three cemeteries: Durkee, Farmers Institute and Hickory Grove.