- Language: Kuuk-Yak
- Alternate names: Kuuk Yak, Koko Yak, Kuku Yak
- Language code: uky
- Language family: Australian, Pama-Nyungan, Paman, Southwestern Pama (SIL classification)
- Number of speakers: No known L1 speakers.
- Vulnerability: Dormant
- Script: Unwritten.
Estimated 40 speakers in 1975, but the date of last speaker’s death unknown.
Kuuk-Yak is spoken in Australia, Australia.