Union Township is one of twelve townships in Hendricks County, Indiana, United States. As of the 2010 census, its population was 1,856.
Union Township covers an area of ; of this, or 0.05 percent is water.
(This list is based on USGS data and may include former settlements.)
The township contains nine cemeteries: Burgess, Cundiff, Groover, Leach Number 1, Leach Number 2, Lizton K of P, Montgomery, Pritchett and Vieley.
It is in the North West Hendricks School Corporation.