Liberty Township is one of thirteen townships in St. Joseph County, in the U.S. state of Indiana. As of the 2000 census, its population was 3,053.
According to the United States Census Bureau, Liberty Township covers an area of ; of this, (98.99 percent) is land and (1.01 percent) is water.
The township contains these four cemeteries: Fair, Old, Porter and Westlawn.