Yahi was a dialect of the extinct Yana language that was spoken in the upper Sacramento Valley area, roughly in the area between Mill Creek and Deer Creek. It is one of the southern dialects of Yana, which is a language isolate, though with possible connections to Hokan. Yana is known as having been the language of Ishi, the last surviving Yana Indian, who worked with anthropologists to make a record of the language and culture.

The last documented speaker of Yahi was a man called Ishi who caused a scientific stir when he made contact with the outside world in 1911, long after the Yahi had been assumed to be extinct. Together with the language, he died in 1916.

Yahi distinguishes male and female forms with male forms, frequently marked with the suffix -na, generally longer than female forms. Some examples are:

Some language samples from Kroeber, T

auna - fire

Some numerals from Sapir et al.,