De Lesseps Field

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| name = De Lesseps Field

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| location =Toronto, Ontario, Canada

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| coordinates = {{coord|43|41|55.6|N|079|29|47.15|W|region:CA-ON|display=inline,title}}

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| pushpin_map = Canada Toronto

| pushpin_label = De Lesseps Field

| pushpin_map_caption = Location in Toronto

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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).{{cite web |title=TREthewey MOdel Farms |url=http://www.trainweb.org/oldtimetrains/CPR_Toronto/TRE_MO_F.htm |website=Old Time Trains |accessdate=31 August 2020}} The airfield was located near present-day Hearst Circle and the Wishbone on a {{convert|600|acre|km2}} site in York Township (just outside Weston, Ontario).{{cite web |title=[Selected Lost Historic Sites] |url=http://www.toronto.ca/torontoplan/lost_examples2.htm |website=Toronto |accessdate=31 August 2020 |archiveurl=https://web.archive.org/web/20030506235717/http://www.toronto.ca/torontoplan/lost_examples2.htm |archivedate=6 May 2003}}

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.[http://ml-in.facebook.com/topic.php?uid=2204919745&topic=2728 Trethewey Airfield]{{dead link|date=April 2018 |bot=InternetArchiveBot |fix-attempted=yes }} 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).

This airfield was one of many airfields in the greater Toronto area during the early 20th Century, but most of the airfields disappeared before World War II:

• Armour Heights Field 1917–1919
• Barker Field 1927–1953
• Downsview Airfield 1929–2024
• Leaside Aerodrome 1927–1931
• Long Branch Aerodrome 1915–1919
• Toronto Aerodrome 1928–1939

Most of the airfield related buildings were temporary or converted from farm use. De Havilland's first factory was in an old vegetable warehouse because it had double doors wide enough to accommodate assembled aircraft. A larger hangar was built in 1929, but it was moved along with the aircraft manufacturer to Downsview.

The later owners of the airfield, Skyways Limited, used the facilities to train pilots.