Newark Liberty International Airport (IATA: EWR, ICAO: KEWR), formerly known as 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 south west of New York City.

The airport is operated by the Port Authority of New York and New Jersey, which manages the three other major airports in metro New York, John F. Kennedy International Airport (JFK), LaGuardia Airport and Teterboro Airport (as well as the Downtown Manhattan Heliport). Newark is the fifth busiest international air gateway to the United States; JFK ranks first.

Newark 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). United Airlines and FedEx operate cargo hubs.

In 2005 Newark Airport handled approximately 33 million passengers; JFK handled about 41 million and LaGuardia about 26 million, making for a total of approximately 100 million travelers using New York's airports. With these numbers, this makes New York's airspace surpass that of Chicago's to become the busiest in the US.