Harry Reid International Airport (IATA: LAS, ICAO: KLAS, FAA LID: LAS), formerly known as McCarran International Airport, is an international airport serving the Las Vegas Valley, a metropolitan area in the U.S. state of Nevada. It is located five miles (8 km; 4 nmi) south of downtown Las Vegas, in the unincorporated area of Paradise, and covers 2,800 acres (4.4 sq mi; 11.3 km2) of land.

Reid is owned by Clark County and operated by the county's Department of Aviation. The airport is named after the late U.S. congressman and senator from Nevada, Harry Reid. It has four runways and two terminals with five gate areas (concourses) all connected with a people mover system. Reid is one of two airports in the United States with slot machines inside the terminals.

The airport opened in January 1943 as Alamo Field and initially catered to general aviation. In December 1948, it was rechristened for U.S. senator Pat McCarran, and commercial airlines shifted to it from the Las Vegas Army Airfield. Passenger counts increased in the 1950s as the Strip expanded, leading to the construction of a new terminal. McCarran later came to be seen as the model for the common-use approach to airport resources in the United States and pioneered radio-frequency identification of baggage.