The Navesink River is an estuary, approximately 8 mi (12 km) long in Monmouth County, New Jersey, United States. It is surrounded by the communities of Middletown, Red Bank, Fair Haven, and Rumson.

Navesink is an unincorporated community and census-designated place (CDP) located on the northernmost stretch of the Jersey Shore in Middletown Township in Monmouth County, in the U.S. state of New Jersey. As of the 2020 United States census, the CDP's population was 2,004, reflecting a decrease of 16 (-0.8%) from thd 2,020 residents enumerated at the 2010 U.S. census.