The Koyukon, Dinaa, or Denaa (Denaakk'e: Tl’eeyegge Hut’aane) are an Alaska Native Athabascan people of the Athabascan-speaking ethnolinguistic group.

Their traditional territory is along the Koyukuk and Yukon rivers where they subsisted for thousands of years by hunting and trapping.

The Koyukon language belongs to a large family called Na-Dené or Athabascan, traditionally spoken by numerous groups of native people throughout northwestern North America.

In addition, due to ancient migrations of related peoples, other Na-Dené languages, such as Navajo and Apachean varieties, are spoken in the American Southwest and in Mexico.

Relative isolation persisted along the Koyukuk until 1898, when the Yukon Gold Rush brought more than a thousand men to the river.