Dettah or Detah is a First Nations community in the North Slave Region of the Northwest Territories, Canada. Located on the Northern shore of Great Slave Lake, just outside the capital of Yellowknife, it is a 6.5 km (4 mi) drive from that town by ice road in winter or a 27 km (18.8 mi) drive on an all-season road. The name means 'Burnt Point' in the Weledeh language, and refers to a traditional fishing camp, used by the Dene for hundreds of years.

According to the 2006 Census, Dettah had a population of 247 people, consisting almost entirely of First Nations. Both it and NDilo (pronounced "Dee-Low") are the communities of the Yellowknives. Dettah is represented by the Yellowknives Dene First Nation (Dettah) and are part of the Akaitcho Treaty 8 Tribal Corporation.

There are four First Nations within the Akaitcho Territory. They are: