Cedar Knolls is an unincorporated community located within Hanover Township in Morris County, in the U.S. state of New Jersey.

[3] Cedar Knolls is in eastern Morris County, in the western part of Hanover Township.

It is bordered to the east by Whippany, to the south by Morris Township, and partially to the west by the borough of Morris Plains.

Interstate 287 forms the eastern border of Cedar Knolls and leads southwest 3 miles (5 km) to Morristown, the county seat, and northeast the same distance to Parsippany.

Cedar Knolls first appeared as a census designated place in the 2020 U.S.