Warren Township is one of twenty-three townships in Jo Daviess County, Illinois, United States.

As of the 2010 census, its population was 1,601, and it contained 770 housing units.

[2] Its name changed from Courtland Township in 1865.

According to the 2010 census, the township has a total area of 19.7 square miles (51 km2), all land.

[2] The township contains two cemeteries: Elmwood and Saint Annes Catholic.