The Shark River Inlet is an inlet that connects the Atlantic Ocean with the Shark River, located entirely in Monmouth County, New Jersey, United States. The Shark River Inlet acts as a border between the towns of Belmar and Avon-by-the-Sea at the Atlantic Ocean. The Shark River Inlet is the only river inlet exclusively in Monmouth County that drains directly into the Atlantic Ocean; the Shrewsbury and Navesink rivers drain into Sandy Hook Bay (part of the much larger Lower New York Bay), and the Manasquan River is shared with Ocean County.
The inlet provides access to a marina where commercial, charter, and private fishing boats are moored.