The Ohlone languages, also known as Costanoan, form a small Indigenous language family historically spoken in Northern California, both in the southern San Francisco Bay Area and northern Monterey Bay area, by the Ohlone people. Along with the Miwok languages, they are members of the Utian language family. The most recent work suggests that Ohlone, Miwok, and Yokuts are branches of a Yok-Utian language family.

The Ohlone, formerly known as Costanoans, are a Native American people of the Northern California coast. When Spanish explorers and missionaries arrived in the late 18th century, the Ohlone inhabited the area along the coast from San Francisco Bay through Monterey Bay to the lower Salinas Valley. At that time they spoke a variety of related languages. The Ohlone languages make up a sub-family of the Utian language family. Older proposals place Utian within the Penutian language phylum, while newer proposals group it as Yok-Utian.