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 present-day 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 Coast Miwok spoke their own Coast Miwok language in the Utian linguistic group. They lived by hunting and gathering, and lived in small bands without centralized political authority. In the springtime they would head to the coasts to hunt salmon and other seafood, including seaweed. Otherwise their staple foods were primarily acorns—particularly from black and tan oak–nuts and wild game, such as deer and cottontail rabbits and black-tailed deer, Odocoileus hemionus columbianus, a coastal subspecies of the California mule deer, Odocoileus hemionus. When hunting deer, Miwok hunters traditionally used Brewer's angelica, Angelica breweri to eliminate their own scent. Miwok did not typically hunt bears. Yerba buena tea leaves were used medicinally.

Tattooing was a traditional practice among Coast Miwok, and they burned poison oak for a pigment. Their traditional houses, called "kotcha", were constructed with slabs of tule grass or redwood bark in a cone-shaped form.

Miwok people are skilled at basketry. A recreated Coast Miwok village called Kule Loklo is located at the Point Reyes National Seashore.^{[citation needed]}

In C. Hart Merriam's discussions with Coast Miwok peoples, he identified three cultural tribes:

These tribes did not have a political structure and so are not "tribes" in that sense. Rather, chiefs or headmen (oi-bu in Olamentko and hoipu in Hookooeko) were empowered at the tribelet level. The Coast Miwok did not have a single name for all three tribes, describing themselves instead by tribe, tribelet, or village, depending on the context. Using Merriam's divisions, the tribelets as shown on the map to the right – itself derived from Milliken – can be classified as:

The Coast Miwok language is still spoken, but the Bodega dialect, spoken by the Olamentko group, is documented in Callaghan (1970). From speaking with Coast Miwok people in the early 1900s, Merriam believed that the Lekahtewutko and Hookooeko dialects were substantially the same.

Ethnobotany of the Coast Miwok. They had extensive knowledge and relationships with local flora. Presumably every plant had a name and purpose. Notable engagement with plants may be viewed from four perspectives: medicinal uses, food sustenance, technology and spiritual significance.