Montréal–Trudeau International Airport (IATA: YUL) or Montréal–Trudeau is an international airport in Dorval, Quebec. It is the only Transport Canada designated international airport serving Montreal and it's situated 12 mi west of Downtown Montreal. There are direct flights to and from about 130 regular and seasonal destinations in Canada, the United States and internationally. Owing to its geographic location, Montréal is a major hub for air traffic between Canada and Europe. The airport terminals are located entirely in the suburb of Dorval, while one runway is located in the Montreal borough of Saint-Laurent.  

Air Canada, the country's flag carrier, also has its corporate headquarters complex on the Saint-Laurent side of the airport.
The airport also serves Greater Montreal and adjacent regions in Quebec and eastern Ontario, as well as the states of Vermont and northern New York in the United States. The airport is named in honour of Pierre Elliott Trudeau, the 15th Prime Minister of Canada and father of current Prime Minister Justin Trudeau.

Montréal–Trudeau is the busiest airport in the province of Quebec and one of the busiest airports in Canada by passenger traffic. The airport also has border preclearance with the United States and is one of the main gateways into Canada with the highest proportion among Canada's airports.

Airlines servicing Trudeau offer year-round non-stop flights to five continents, namely Africa, Asia, Europe, North and South America. Trudeau airport is the headquarters of and a large hub for Air Canada, the country's largest airline. It is also the headquarters of Air Inuit and Air Transat and an operation base for Sunwing Airlines and Porter Airlines. The airport also plays a role in general aviation as home to the headquarters of Innotech-Execair, Starlink, ACASS and Maintenance Repair & Overhaul (MRO) facilities of Air Transat and Air Inuit. Transport Canada operates a Civil Aviation Maintenance, Repair and Overhaul facility on site, with a fleet of Government-owned and operated civil aircraft. Bombardier Aerospace has an assembly facility on site where they build Global and Challenger business jets.

Montréal-Trudeau Airport has world-class air terminals designed to provide you with the most efficient, comfortable and safe airport experience possible. Equipped with the latest airport technologies, it also offers a comprehensive range of services to suit all tastes and budgets. The airport consists of one two-storied terminal, divided into four different zones: the public area (departures and arrivals level), the domestic jetty, the international jetty and the transborder jetty. 

Domestic jetty: The domestic jetty, which is accessible via security checkpoint A, is divided into two parts: a satellite jetty connected by a tunnel to the main terminal and a wing attached to the main terminal building. The main jetty holds 16 gates: 1 through 12, 15, and 47 through 49. The satellite jetty holds another 10 gates: 17, 19, 21, 23, 25, 27, 28, 30, 32 and 34. There are only two boarding bridges located inside the satellite (17 and 21) as the other gates are mostly used for prop aircraft like the Bombardier Dash 8 family. 

International jetty: The International jetty, also accessible via the security checkpoint A, is dedicated to flights with destinations outside Canada and the United States. This jetty holds 18 gates: 50 through 53 and 55 through 68. Gates 53 and 62 are used exclusively for Passenger Transfer Vehicles. In this area, travellers can shop, eat and relax with a wide variety of boutiques, restaurants, cafés, spa facilities and one of the biggest airport duty-free shops in Canada.

Transborder jetty: The transborder jetty is dedicated to all U.S.-bound flights, and has 18 gates: 72 through 89. For access to gates 87, 88 or 89, passengers must go down one level via an escalator. Gate 56, 58 and 60 (part of the international jetty) can also be used for U.S.-bound flights. They can be isolated from the other gates by moving glass walls known as swing gates. Unlike other jetties, the transborder jetty requires passengers to go through security checkpoint C and then the U.S. Customs and Border Protection and lastly through the duty-free shop before accessing their gates. The gate area contains the same services as the other parts of the airport such as shops, restaurants, rest zones and cafés. If needed, some gates can be isolated to offer additional security checkpoints if an aircraft flies to a potential risk zone like Washington–National.

Two major airline alliances (SkyTeam and Star Alliance) are present at Montréal-Trudeau, and therefore both maintain frequent flyer lounges within the airport. There are also three "Pay-In" lounges open for use by all passengers, regardless of airline, frequent flyer status or class of travel.

There are currently two runways in operation at Montréal-Trudeau: two parallel runways aligned in a northeast–southwest direction (06L/24R and 06R/24L.) There was another single runway in an east–west direction (10/28), but it was permanently decommissioned in July 2023. The former runway is now a taxiway and will continue to be used as such.

Montréal–Trudeau is accessible by six bus routes operated by the Société de Transport de Montréal (STM): one dedicated airport transfer service, one express route, two regular daytime routes, and two-night buses.

Montréal-Trudeau International Airport is Certified as a 4-Star Airport by Skytrax for facilities, comfort, cleanliness, shopping, food & beverages and staff service.