- Language: Koyukon
- Alternate names: Denaakk'e, Ten'a
- Language code: koy
- Language family: Eyak-Athabaskan, Athabaskan, Northern Athabaskan (SIL classification)
- Number of speakers: 150
- Vulnerability: Endangered
- Script: Latin script.
"The name Koyukon is not Koyukon in origin or Athabaskan at all; it comes through a Russian spelling for an Eskimo term that a Russian trader decided for no clear reason to apply to the Koyukuk River." (Krauss 2000)