Watsessing is a neighborhood and census-designated place (CDP) located in Bloomfield Township, Essex County, in the U.S. state of New Jersey. It is in the southwest corner of the township, bordered to the northwest by Glen Ridge, to the southwest by East Orange, to the southeast by the Ampere North part of Bloomfield, and to the northeast by the rest of Bloomfield. Watsessing Park is in the center of the community, in the valley of the Second River or Watsessing River, part of the Passaic River watershed.