Peace Valley is a valley in the northwestern corner of Los Angeles County, California, running northeast−southeast along the San Andreas Fault and a section of Interstate 5 near Tejon Pass.

Hungry Valley State Vehicle Recreation Area is located to the southwest and meets the valley at the north end of Coyote Canyon.

The tripoint between Kern, Los Angeles, and Ventura counties is located within the northwestern portion of the valley, at 34°47′28″N 118°52′55″W / 34.79101°N 118.88194°W / 34.79101; -118.88194.

The valley is located at ecological transition zone between the semi-arid montane chaparral of the Transverse Ranges and the desert plant communities of the nearby Antelope Valley.

The I-5 intersection with California State Route 138 is in its eastern section.