The Briones Hills form a low mountain range in western Contra Costa County, in the East Bay region of the San Francisco Bay Area, California, United States.

[2] The United States Geological Survey (USGS) Geographic Names Information System, however, includes the Briones Hills as part of the Diablo Range in its list of GPS coordinates for the latter.

Cities and towns adjacent to or in the foothills of the range include: Briones, Lafayette, Martinez, Orinda, Pleasant Hill, Alhambra Valley, and Walnut Creek.

Briones Reservoir, of the East Bay Municipal Utility District (EBMUD), is located in the western area.

The headwaters of Pinole Creek are in the Briones Hills, on the western slope of Costa Peak.