Eagle Creek Township is one of eleven townships in Lake County, Indiana, United States. As of the 2010 census, its population was 1,668 and it contained 709 housing units.
Eagle Creek Township was established in 1839.
The Kingsbury-Doak Farmhouse was listed in the National Register of Historic Places in 2005.
According to the 2010 census, the township has a total area of , of which (or 99.70%) is land and (or 0.29%) is water.
Eagle Creek Township, along with Cedar Creek Township and West Creek Township, is served by the Tri-Creek School Corporation which includes Lowell High School.