Two Rock is an unincorporated community in Sonoma County, California, United States. It is located on Stemple Creek in a rural area west of Petaluma. A hill named Dos Piedros (Spanish for "two rocks", 157 feet (48 m) above sea level) overlooks the community from the north.
The main road is Valley Ford Road, which passes northwest-southeast through Two Rock.
The Coast Guard's Training Center Petaluma facility is located just south of Two Rock.
Two Rock used to provide basic services to local ranches, but little remains today.