The Coast Miwok are an Indigenous people of California that were the second-largest tribe of the Miwok people. Coast Miwok inhabited the general area of modern Marin County and southern Sonoma County in Northern California, from the Golden Gate north to Duncans Point and eastward to Sonoma Creek. Coast Miwok included the Bodega Bay Miwok, or Olamentko (Olamentke), from authenticated Miwok villages around Bodega Bay, the Marin Miwok, or Hookooeko (Huukuiko), and Southern Sonoma Miwok, or Lekahtewutko (Lekatuit). While they did not have an overarching name for themselves, the Coast Miwok word for people, Micha-ko, was suggested by A. L. Kroeber as a possible endonym, keeping with a common practice among tribal groups and the ethnographers studying them in the early 20th Century and with the term Miwok itself, which is the Central Sierra Miwok word for people.

The Miwok are members of four linguistically related Native American groups indigenous to what is now Northern California, who traditionally spoke one of the Miwok languages in the Utian family. The word Miwok means people in the Miwok languages.