Hamblen Township is one of four townships in Brown County, Indiana. As of the 2020 census, its population was 4,470 (up from 4,336 at 2010) and it contained 2,641 housing units.
Hamblen Township was named for Job Hamblen, a pioneer settler.
According to the 2010 census, the township has a total area of , of which (or 98.54%) is land and (or 1.46%) is water.
(This list is based on USGS data and may include former settlements.)
The township contains six cemeteries: Anderson, Calvin, Duncan, Mount Moriah, Taylor and Zion Church.