East Hanover Township is a township in Morris County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 11,105, a decrease of 52 (−0.5%) from the 2010 census count of 11,157, which in turn reflected a decline of 236 (−2.1%) from the 11,393 counted in the 2000 census.

The Whippany River is a tributary of the Rockaway River, approximately 20 mi (30 km) long, in northern New Jersey in the United States.