Proto-Yeniseian is the reconstructed ancestor of the Yeniseian languages (Ket and the extinct Arin, Assan, Kott, Pumpokol, Yug).
Currently, the transcription of phonemes in Proto-Yeniseian is taken over directly from Vajda (2022):
| Bilabial | Alveolar | Postalveolar | Retroflex | Palatal | Labiovelar | Velar | Uvular | ||
|---|---|---|---|---|---|---|---|---|---|
| Nasal | *m | *n | *ŋʷ | *ŋ | |||||
| Plosive | voiceless | *p | *t | *č /t͡ʃ/ | *tʳ /ʈ/ | *c | *kʷ | *k | *q |
| voiced | *b | *d | *ǰ /d͡ʒ/ | *dʳ /ɖ/ | *ɟ | *ɡʷ | *ɡ | *ɢ | |
| Fricative | *s | *š /ʃ/ | *sʳ /ʂ/ | *ç | *xʷ | *x | *χ | ||
| Lateral | *ɬ | *tɬ | |||||||
| Approximant | *w | *j | |||||||
| Rhotic | *r | ||||||||
| Front | Central | Back | |
|---|---|---|---|
| Close | *i *ij *iw | *u *uj *uw | |
| Mid | *e *ej *ew | *o *oj *ow | |
| Open | *a *aj *aw |
All Proto-Yeniseian reconstructions should feature at least two descendants or a derived term and a descendant. The current standard for listing descendants is as such:
* Northern Yeniseian:
** {{desc|ket|}}
** {{desc|yug|}}
* Southern Yeniseian:
** {{desc|xrn|}}
** {{desc|xss|}}
** {{desc|zko|}}
** {{desc|xpm|}}
The main sources for Proto-Yeniseian reconstructions are works by Edward J. Vajda, including {{R:qfa-yen:Fortescue–Vajda:2022}}, {{R:qfa-yen:Vajda:2024}}.