Widner Township is one of ten townships in Knox County, Indiana. As of the 2010 census, its population was 1,094 (down from 1,132 at 2010) and it contained 506 housing units. It contains the census-designated place of Freelandville.
Widner Township was named for John Widner, a pioneer settler.
Kixmiller's Store at Freedlandville was added to the National Register of Historic Places in 1978.
According to the 2010 census, the township has a total area of , of which (or 99.90%) is land and (or 0.10%) is water.
It is in the North Knox School Corporation.