Markham Airport or Toronto/Markham Airport (TC LID: CNU8) is a private aerodrome operating 2.6 nautical miles (4.8 km; 3.0 mi) north of Markham, Ontario, Canada near Toronto.

The airport was founded in 1965 by two former Polish air force pilots and is operated by Markham Airport Inc. The airport is not part of the Greater Toronto Airports Authority (GTAA). It consists of a single 2,013 ft (614 m) runway for small and private aircraft only (with night flying capabilities). The Royal Canadian Air Cadets Gliding Program uses the north side of the runway 09/27 for glider operations in the spring and fall, and use a northern traffic pattern.