Newark Liberty International Airport (IATA: EWR , ICAO: KEWR , FAA LID: EWR ), first named Newark Airport and later Newark International Airport , is an international airport within the city limits of both Newark and Elizabeth, New Jersey, United States. It is about 15 miles (24 km) southwest of Midtown Manhattan (New York City).

The airport is operated by the Port Authority of New York and New Jersey, which also manages the two other major airports in the New York/New Jersey metropolitan area, John F. Kennedy International Airport (JFK) and LaGuardia Airport (LGA), in addition to three smaller airports, Stewart International Airport, Teterboro Airport and the Downtown Manhattan Heliport. Newark is the tenth busiest airport in the United States and the nation's fifth busiest international air gateway; JFK ranks first.

Newark Liberty is the second-largest hub for Continental Airlines, which is the airport's largest tenant (operating all of Terminal C and part of Terminal A). Primarily due to this large hub operation, Continental Airlines is by far the leading carrier in the New York market. FedEx Express operates one of its major cargo hubs at Newark.

In 2007, Newark Airport handled slightly more than 36.3 million passengers, compared to JFK's 47.8 million and LaGuardia's 25.3 million. In total over 111 million passengers used New York airports in 2007, making New York the busiest airport system in the United States in terms of passenger numbers and second in the world behind London.