Lynch Creek is a 7.1-mile-long (11.4 km)[2] stream in Sonoma County, California, United States which discharges into the Petaluma River.

After crossing Adobe Road, it flows through Rooster Run Golf Club and enters suburban Petaluma, where it flows southwestward.

It crosses Sonoma Mountain Parkway and Maria Drive and follows the western edge of Lucchesi Park to North McDowell Boulevard.

From the south side of the Boulevard, it continues southward, passing under U.S. 101 at Sonoma County milepost 5.19 to feed into the Petaluma River near Jess Avenue.

Lynch Creek is spanned by several bridges, including:[3] Lynch Creek provides habitat for a variety of threatened and endangered species including chinook salmon (Oncorhynchus tshawytscha), steelhead trout (Oncorhyncus mykiss), and the foothill yellow-legged frog (rana boylii).