Miami International Airport (IATA: MIA, ICAO: KMIA, FAA LID: MIA), also known as MIA and historically as Wilcox Field, is the primary international airport serving Miami and its surrounding metropolitan area, in the U.S. state of Florida. It hosts over 1,000 daily flights to 195 domestic and international destinations, including most countries in Central and South America and the Caribbean. The airport is in an unincorporated area in Miami-Dade County, Florida, 8 miles (13 km) west-northwest of downtown Miami, in metropolitan Miami, adjacent to the cities of Miami and Miami Springs, and the village of Virginia Gardens. Nearby cities include Hialeah, Doral, and the census-designated place of Fontainebleau.

In 2021, Miami International Airport became the busiest international cargo airport in the U.S. and the busiest U.S. gateway for international passengers, surpassing John F. Kennedy International Airport in New York City. As of 2021, it is the 10th busiest airport in the U.S. with 17,500,096 passengers for the year. It is Florida's busiest airport by total aircraft operations and total cargo traffic. The airport is American Airlines' third-largest hub and serves as its primary gateway to Latin America and the Caribbean. Miami also serves as a focus city for Avianca, Frontier Airlines, and LATAM, both for passengers and cargo operations.

In 2024, MIA Airport served nearly 56 million passengers and saw 3 million tons of cargo passing through MIA, recording three consecutive record years for passenger volume and five straight years of cargo volume.

Miami International Airport covers 3,300 acres (1,300 ha). It is South Florida's main airport for long-haul international flights and a hub for the Southeastern United States with passenger and cargo flights to cities throughout the Americas, Europe, Africa, and Asia. It is the largest gateway between the U.S. and Central, South America and the Caribbean and one of the largest airline hubs in the nation.

In June 1928, Pan American Airways acquired 116 acres of land on NW 36th Street for the purpose of building a privately owned and operated international airport in Miami, Florida. The establishment of a commercial airport and of regularly scheduled international passenger airline service by Pan Am was a transformative event for the City of Miami. By September 1928, Pan Am had begun to operate regularly scheduled Air Mail service between Miami and Havana. On January 9, 1929, Pan American Airport, also known as Pan American Field, was officially dedicated at a ceremony attended by thousands of residents and celebrities such as Amelia Earhart, who saw in the new airport the promise of a bright new future in international aviation for Miami. It was the first mainland airport in the United States to have international port of entry facilities. The passenger terminal building, designed by Delano & Aldrich of New York City, was the most advanced and luxurious in the country. Three hangars, two on the east and one on the west, provided housing and maintenance facilities for Pan Am's fleet of Sikorsky amphibian and Fokker aircraft.

During the first few years of its operation, from late 1928 until late 1930, it was from this busy airport that Pan American Airways historically pioneered U.S. international passenger aviation, inaugurating regularly scheduled Air Mail and passenger airline service from the U.S. to the West Indies, Caribbean, and Central and South America. In the 1930s Pan American leased space at its airport to Eastern Air Lines. Eastern officially took up residence at the 36th Street Airport in August 1935.

In 1940, Intercontinent Corporation, owned by William Pawley, built an aircraft manufacturing plant on land acquired immediately east of Pan American Field. The City and County, eager to encourage the growth of an aircraft manufacturing industry in Miami, agreed to finance and build runways and ground facilities at the Intercontinent plant, including an east-west runway that extended from Le Jeune Road as far west as Pan American Field, where it intersected with Pan Am's east-west runway. National Airlines, which had been operating in Miami at Miami's city-owned Municipal Airport since 1937, moved to the 36th Street Airport in 1942. National used a terminal on LeJeune Road, across the street from the airport and would stop traffic on the road in order to taxi aircraft to and from its terminal. Miami Army Airfield opened in 1943 on 1400 acres of land acquired during World War II to the south of Pan American Field. The two airfields were listed in some directories as a single facility.

Following World War II, the Dade County Port Authority embarked on a long-planned airport expansion in order to meet Miami's increasing commercial aviation needs. On December 31, 1945, a formal agreement between the County and Pan Am transferring ownership of the airport to the County was signed, becoming effective at 1:00 AM on January 1, 1946. Thus ended any distinct identity of Pan American Field. It also acquired Intercontinent's former holdings, which were leased to Eastern Air Lines, and changed the name of the newly expanded airport to Miami International Airport. Pan American's former NW 36th Street terminal building continued to serve as the hub for the new Miami International Airport. Between 1945 and 1950, the Port Authority cobbled together thousands more acres adjacent to and south of the airport, including the Army’s former air base; the Seaboard Air Line Railroad property; and additional parcels, with the intention of meeting Miami’s future aviation needs. The result was a County-owned, Miami International Airport based at NW 36th Street that by 1948 had grown to 2500 acres. The former domed-roofed Pan Am terminal building was extensively remodeled and enlarged, the words “Miami International Airport” now curving across its façade. The new airport was officially dedicated January 4, 1950. United States Air Force Reserve troop carrier and rescue squadrons also operated from the airport from 1949 through 1959, when the last unit relocated to nearby Homestead Air Force Base (now Homestead Air Reserve Base). In the late 1940s, Pan Am and Eastern also expanded their bases at MIA on NW 36th Street, which made the airport the world's largest commercial aircraft maintenance and overhaul facility at the time.