Trefork Lake (), is a lake in King Frederik VIII Land, Northeastern Greenland. The lake and its surroundings are part of the Northeast Greenland National Park zone.
The Danish weather station Danmarkshavn âÂÂthe only inhabited place in the areaâ lies about to the east.
The lake was named "Trident Lake" () by the 1952âÂÂ54 British North Greenland expedition because of its shape.
Trefork Sø is the largest lake in the northern part of Queen Louise Land. The lake is located between the large Admiralty and Borgjokel glaciers. The terminus of the smaller Trefork Glacier is at the southwestern end. The Ad Astra Ice Cap rises to the northeast.