Boundary Bay Airport or Vancouver/Boundary Bay Airport (IATA: YDT, ICAO: CZBB) is located beside Boundary Bay and 2.5 nautical miles (4.6 km; 2.9 mi) east of Ladner in Delta, British Columbia, Canada, 8.5 NM (15.7 km; 9.8 mi) south southeast of Vancouver and close to the Point Roberts-Boundary Bay border crossing. The airport, which opened on July 11, 1983, serves mostly general aviation and includes facilities for aircraft maintenance, flight training and parking. In 2020 and 2021, Boundary Bay airport was ranked as the busiest airport in Canada by aircraft movements.

The airport is classified as an airport of entry by Nav Canada and is staffed by the Canada Border Services Agency (CBSA). CBSA officers are available on call to handle entry for aircraft carrying no more than 15 passengers.