The Indigenous peoples of California (known as Native Californians) are the indigenous inhabitants who have lived or currently live in the geographic area within the current boundaries of California before and after the arrival of Europeans. With over forty groups seeking to be federally recognized tribes, California has the second largest Native American population in the United States. The California cultural area does not conform exactly to the state of California's boundaries. Many tribes on the eastern border with Nevada are classified as Great Basin tribes, and some tribes on the Oregon border are classified as Plateau tribes. Tribes in Baja California who do not cross into California are classified as Indigenous peoples of Mexico.
Before European contact, native Californians spoke over 300 dialects of approximately 100 distinct languages. The large number of languages has been related to the ecological diversity of California, and to a sociopolitical organization into small tribelets (usually 100 individuals or fewer) with a shared "ideology that defined language boundaries as unalterable natural features inherent in the land".
"The majority of California Indian languages belong either to highly localized language families with two or three members (e.g. Yukian, Maiduan) or are language isolates (e.g. Karuk, Esselen)." Of the remainder, most are Uto-Aztecan or Athapaskan languages. Larger groupings have been proposed. The Hokan superstock has the greatest time depth and has been most difficult to demonstrate; Penutian is somewhat less controversial.
There is evidence suggestive that speakers of the Chumashan languages and Yukian languages, and possibly languages of southern Baja California such as Waikuri, were in California prior to the arrival of Penutian languages from the north and Uto-Aztecan from the east, perhaps predating even the Hokan languages. Wiyot and Yurok are distantly related to Algonquian languages in a larger grouping called Algic. The several Athapaskan languages are relatively recent arrivals, no more recent than about 2000 years ago.
Evidence of human occupation of California dates from at least 19,000 years ago. Prior to European contact, California Indians had 500 distinct sub-tribes or groups, each consisting of 50 to 500 individual members. The size of California tribes today are small compared to tribes in other regions of the United States. Prior to contact with Europeans, the California region contained the highest Native American population density north of what is now Mexico. Because of the temperate climate and easy access to food sources, approximately one-third of all Native Americans in the United States were living in the area of California.
Early Native Californians were hunter-gatherers, with seed collection becoming widespread around 9,000 BC. Due to the local abundance of food, tribes never developed agriculture or tilled the soil. Two early southern California cultural traditions include the La Jolla Complex and the Pauma Complex, both dating from ca. 6050—1000 BC. From 3000 to 2000 BC, regional diversity developed, with the peoples making fine-tuned adaptations to local environments. Traits recognizable to historic tribes were developed by approximately 500 BC.
The indigenous people practiced various forms of sophisticated forest gardening in the forests, grasslands, mixed woodlands, and wetlands to ensure availability of food and medicine plants. They controlled fire on a regional scale to create a low-intensity fire ecology; this prevented larger, catastrophic fires and sustained a low-density "wild" agriculture in loose rotation. By burning underbrush and grass, the natives revitalized patches of land and provided fresh shoots to attract food animals. A form of fire-stick farming was used to clear areas of old growth to encourage new in a repeated cycle; a permaculture.
Different tribes encountered non-native European explorers and settlers at widely different times. The southern and central coastal tribes encountered Spanish and British explorers in the mid-16th century. Tribes such as the Quechan or Yuman Indians in present-day southeast California and southwest Arizona first encountered Spanish explorers in the 1760s and 1770s. Tribes on the coast of northwest California, like the Miwok, Yurok, and Yokut, had contact with Russian explorers and seafarers in the late 18th century. In remote interior regions, some tribes did not meet non-natives until the mid-19th century.
The Spanish began their long-term occupation in California in 1769 with the founding of Mission San Diego de Alcalá in San Diego. The Spanish built 20 additional missions in California. Their introduction of European invasive plant species and non-native diseases resulted in unintended havoc and high fatalities for the Native populations.
The population of Native California was reduced by 90% during the 19th century—from more than 200,000 in the early 19th century to approximately 15,000 at the end of the century, mostly due to disease. Epidemics swept through California Indian Country, such as the 1833 malaria epidemic.
In 1834 Mexico secularized the Church's missions and confiscated their properties. But the new government did not return their lands to tribes but made land grants to settlers of at least partial European ancestry. Many landless Indians found wage labor on ranches. Following the United States victory in the Mexican-American War, it took control of California in 1848 with the signing of the Treaty of Guadalupe Hidalgo. Its administrators worked to honor Mexican land grant title but did not honor aboriginal land title.
California has the largest population of Native Americans out of any state in the United States, with 723,000 identifying an "American Indian or Alaska Native" tribe as a component of their race (14% of the nation-wide total). This population grew by 15% between 2000 and 2010, much less than the nation-wide growth rate of 27%, but higher than the population growth rate for all races, which was about 10% in California over that decade. Over 50,000 indigenous people live in Los Angeles alone. According to the National Conference of State Legislatures, there are currently over one hundred federally recognized native groups or tribes in California including those that spread to several states.  Federal recognition officially grants the Indian tribes access to services and funding from the Bureau of Indian Affairs.
Acorns are a primary traditional food throughout much of California. Corn was very important to them as well. Their diet includes fish, shellfish, deer, elk, and antelope, and plants such as buckeye, sage seed, and yampah (Perideridia gairdneri).
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