Naval Outlying Landing Field Imperial Beach or NOLF Imperial Beach (IATA: NRS, ICAO: KNRS, FAA LID: NRS) is a United States Navy facility for helicopters, situated on 1,204 acres (5 km²) approximately 14 miles (23 km) south of San Diego and within the city limits of Imperial Beach, California. It is known as "The Helicopter Capital of the World".

The mission of NOLF Imperial Beach at the present time as described, is to handle the overflow of helicopter squadrons traffic both VFR and IFR, from North Island. As a result, the helicopter squadrons at North Island do 95 percent of their operations at Imperial Beach.

In 1917, the United States Army established Aviation Field on the current site of OLF Imperial Beach. Aviation Field was used for air gunnery practices, among other things, by the Army and was kept active throughout World War I. In 1918, it was renamed in honor of Army Major William Roy Ream, the first flying surgeon of the American Army and the first flight surgeon killed in an aircraft accident.

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