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. The airport is named in honour of Lester B. Pearson, who served as the 14th Prime Minister of Canada (1963–1968) and received the Nobel Peace Prize in 1957 for his humanitarian work in peacekeeping.

Toronto Pearson is located 22.5 kilometres (14.0 mi) northwest of Downtown Toronto with the majority of the airport situated in Mississauga and a small portion of the airfield, along Silver Dart Drive north of Renforth Drive, extending into Toronto's western district of Etobicoke. It has five runways and two passenger terminals along with numerous cargo and maintenance facilities on a site that covers 1,867 hectares (4,613 acres).

Pearson is the largest and busiest airport in Canada, handling 44.3 million passengers in 2022. As of 2019, it was the second-busiest international air passenger gateway in North America and the 24th-busiest airport in the world by passenger traffic.

Toronto Pearson is the primary hub for Air Canada. It also serves as a hub for WestJet, cargo airline FedEx Express, and as a base of operations for Air Transat and Sunwing Airlines. Toronto Pearson is operated by the Greater Toronto Airports Authority (GTAA) as part of Transport Canada's National Airports System.