Hickory Grove Township is one of eleven townships in Benton County, Indiana. As of the 2020 census, its population was 398 and it contained 168 housing units. It was organized in March 1876 and named for a grove of hickory trees that grew within its borders in the 19th century.
According to the 2020 census, the township has a total area of , all land.
The township contains one cemetery, Totheroh.