The Lake Miwok language is an extinct language of Northern California, traditionally spoken in an area adjacent to the Clear Lake. It is one of the languages of the Clear Lake Linguistic Area, along with Patwin, East and Southeastern Pomo, and Wappo.

The consonant inventory of Lake Miwok differs substantially from the inventories found in the other Miwok languages. Where the other languages only have one series of plosives, Lake Miwok has four: plain, aspirated, ejective and voiced. Lake Miwok has also added the affricates č, c, čʼ, cʼ, ƛʼ and the liquids r and ł. These sounds appear to have been borrowed through loanwords from other, unrelated languages in the Clear Lake area, after which they spread to some native Lake Miwok words.

The word order of Lake Miwok is relatively free, but SOV (subject–object–verb) is the most common order.

In her Lake Miwok grammar, Callaghan reports that one speaker distinguishes between 1st person dual inclusive ʔoc and exclusive ʔic. Another speaker also remembers that this distinction used to be made by older speakers.

Nouns can be inflected for ten different cases:

kukú-n

flea-SBJ

ʔin