De Lesseps Field was a small, but important airfield in early aviation in Toronto, Ontario, Canada.

Opened sometime before 1910, an airfield was created from three farms by engineer William Griffith Trethewey (1865–1926). The airfield was located near present-day Hearst Circle and the Wishbone on a 600 acres (2.4 km2) site in York Township (just outside Weston, Ontario).

The grassy airfield was later used by French aviator Count Jacques Benjamin de Lesseps (1883–1927) and later renamed after him. The property remained in the hands of the Trethewey family after the death of Trethewey, but in 1928 Trethewey's son Fred sold it to airline Skyways Limited. de Havilland Canada established their first home here in 1928 (building a small hangar) to build Gipsy Moth and Tiger Moth aircraft, but left for Downsview in 1929. Skyways remained owners until some time after 1931 and the airline moved to the Malton Airport. The farm and airfield was later re-developed as residential housing forming what is now the residential neighbourhood called Brookhaven-Amesbury. No trace of the airfield remains in the area.

Besides aircraft manufacturing, the airfield hosted air shows starting in 1910 (hosted by the Ontario Motor League).