Indianapolis International Airport (IATA: IND, ICAO: KIND, FAA LID: IND) is an international airport located seven miles (11 km) southwest of Downtown Indianapolis in Marion County, Indiana, United States. It is owned and operated by the Indianapolis Airport Authority, and the airport serves over 50 non-stop destinations throughout North America and Europe across multiple carriers. As of 2024, IND is the 46th-busiest airport in the U.S. and the busiest in Indiana with 5,180,917 passengers.

The airport occupies 7,700 acres (3,116 ha) in Wayne and Decatur townships in Marion County. IND is home to the second largest FedEx Express hub in the world; only the FedEx SuperHub in Memphis, Tennessee, surpasses its cargo traffic. Largely because of FedEx's activity, IND consistently ranks among the top 10 busiest U.S. airports in terms of air cargo throughput. Republic Airways is also headquartered at the airport, and Allegiant Air maintains Indianapolis as an operating base.

The Indianapolis Air Route Traffic Control Center (ZID), one of 22 established FAA area control centers, is located on the airport property's north side.

The Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2025–2029 categorized it as a medium hub primary commercial service facility.

Indianapolis Municipal Airport opened on September 24, 1931, replacing the older Stout Field as the primary city airport. The airport was initially built on about 320 acres (130 ha) of land in the southwestern edge of the city, with an additional 627 acres (254 ha) reserved for future expansions at the airport. In 1944, it was renamed Weir Cook Municipal Airport, after US Army Air Forces Col. Harvey Weir Cook of Wilkinson, Indiana, who had become a flying ace during World War I with seven victories and had died flying a P-39 over New Caledonia in World War II.

Indianapolis was one of many stops along the first transcontinental air/rail service between Los Angeles and New York that was started by Transcontinental Air Transport (TAT) in 1929. TAT would later become Trans World Airlines (TWA) and continued to serve IND until their merger into American Airlines in 2001.

Since 1962, the airport has been owned and operated by the Indianapolis Airport Authority (IAA). The IAA has an eight-member board with members appointed by the mayor of Indianapolis and other officials from Marion, Hendricks, and Hamilton counties in central Indiana. In 1976, the board renamed the airport Indianapolis International Airport.

From 1957 to 2008, the passenger terminal was on the east side of the airfield off High School Road. This now-demolished facility was renovated and expanded many times, notably in 1968 (Concourses A and B), 1972 (Concourse D), and 1987 (Concourse C and the attached parking garage). This complex, along with the International Arrivals Terminal (opened in 1976) on the north side of the airfield (off Pierson Drive), was replaced by the Col. H. Weir Cook Terminal on November 12, 2008.