Deer Lake First Nation is an Oji-Cree First Nations band government in Northern Ontario, located north of Red Lake, Ontario, Canada. It is one of the few First Nations in Ontario to have signed Treaty 5. It is part of the Keewaytinook Okimakanak Council and the Nishnawbe Aski Nation. As of December 2007, the First Nation had 1,072 registered members, of which their on-reserve population was 868.