Toronto Pearson International Airport (IATA: YYZ, ICAO: CYYZ) is an international airport located in Mississauga, Ontario, Canada. It is the main airport serving Toronto, its metropolitan area, and the surrounding region known as the Golden Horseshoe. Pearson is the largest and busiest airport in Canada, handling 44.8 million passengers in 2023. It is named in honour of Lester B. Pearson, the 14th Prime Minister of Canada and 1957 Nobel Peace Prize laureate for his humanitarian work in peacekeeping.

Pearson International Airport is situated 25 kilometres (16 mi) northwest of Downtown Toronto in the adjacent city of Mississauga, with a small portion of the airfield extending into Toronto's western district of Etobicoke. It has five runways and two passenger terminals along with numerous cargo, maintenance, and aerospace production facilities on a site that covers 1,867 hectares (4,613 acres).

Toronto Pearson is the primary global hub for Air Canada. It also serves as a hub for Porter Airlines and cargo airline FedEx Express, as a focus city for Air Transat and WestJet, and a base of operations for Flair Airlines and Sunwing Airlines. Pearson is operated by the Greater Toronto Airports Authority (GTAA) as part of Transport Canada's National Airports System and is supported by around 50,000 workers. The airport maintains facilities for United States border preclearance.