- Language: Coast Miwok
- Alternate names: Costal Miwok, Miwok (Bodega), Miwok (Coast), Miwok, Coast, Bollanos
- Language code: csi
- Language family: Miwok-Costanoan, Miwokan, Western Miwokan (SIL classification)
- Number of speakers: 0
- Vulnerability: Dormant
Distinct from other Miwok varieties. Became extinct in 1960s or 1970s. Bodega and Marin Miwok dialects were possibly separate languages.
The last known person to have direct knowledge of the language died in the 1970s.